Science10_q1_mod5_evidence-of-plate-movements_ver2.pdf

10 Science Quarter 1 – Module 5: Evidence of Plate Movements CO_Q1_Science10_Module5 Science – Grade 10 Alternative Delivery Mode Quarter 1 – Module 5: Evidence of Plate Movements First Edition, 2020 Republic Act 8293, section 176 states that: No copyright shall subsist in any work of the Government of the Philippines. However, prior approval of the government agency or office wherein the work is created shall be necessary for the exploitation of such work for a profit. Such agency or office may, among other things, impose as a condition the payment of royalties. Borrowed materials (i.e., songs, stories, poems, pictures, photos, brand names, trademarks, etc.) included in this module are owned by their respective copyright holders. Every effort has been exerted to locate and seek permission to use these materials from their respective copyright owners. The publisher and authors do not represent nor claim ownership over them. Published by the Department of Education Secretary: Leonor Magtolis Briones Undersecretary: Diosdado M. San Antonio Development Team of the Module Writer: Marianne D. Soriano Editors: Ma. Maila C. Justo, Jerry R. Junio Reviewers: Jaime Campos, Jr., Jerry R. Junio, Ma. Criselda G. Ocang, German J. Ferrer Jr., Ellen F. Fernandez, Gina A. Amoyen Editha T. Giron Illustrator: Reynaldo C. Poquiz Layout Artists: Reyna H. Talinio Management Team: Tolentino G. Aquino, Arlene A. Niro, Gina A. Amoyen, Editha T. Giron, Carmina C. Gutierrez, Rustico P. Abalos, Jr Marilou D. Roldan, Jerry R. Junio Printed in the Philippines by ________________________ Department of Education – Region I Office Address: Flores St., Catbangen, City of San Fernando, La Union Telefax: (072) 682-2324; (072) 607-8137 E-mail Address: [email protected] 10 Science Quarter 1 – Module 5: Evidence of Plate Movements Introductory Message This Self-Learning Module (SLM) is prepared so that you, our dear learners, can continue your studies and learn while at home. Activities, questions, directions, exercises, and discussions are carefully stated for you to understand each lesson. Each SLM is composed of different parts. Each part shall guide you step-by- step as you discover and understand the lesson prepared for you. Pretest is provided to measure your prior knowledge on lessons in each SLM. This will tell you if you need to proceed on completing this module or if you need to ask your facilitator or your teacher’s assistance for better understanding of the lesson. At the end of each module, you need to answer the posttest to self-check your learning. Answer keys are provided for each activity and test. We trust that you will be honest in using these. In addition to the material in the main text, Notes to the Teacher are also provided to our facilitators and parents for strategies and reminders on how they can best help you on your home-based learning. Please use this module with care. Do not put unnecessary marks on any part of this SLM. Use a separate sheet of paper in answering the exercises and tests. And read the instructions carefully before performing each task. If you have any questions in using this SLM or any difficulty in answering the tasks in this module, do not hesitate to consult your teacher or facilitator. Thank you. ii What I Need to Know You have learned from your previous lessons that lithospheric plates or the solid part of the Earth are gradually moving to form different geologic events such as earthquakes, mountain buildings, and volcanoes. But what causes these plates to move? What is the evidence that the Earth's Plates are moving? These questions ignited our scientists' curiosity to look for answers and lead to the development of the following ideas: Continental Drift Theory, Seafloor Spreading, and Earth's Magnetic Reversal. After going through this module, you are expected to enumerate the lines of evidence that support the plate movement (S9ES –Ia-j-36.6). Specifically, you will learn to: ✓ investigate the pieces of evidence of the Continental Drift Theory; ✓ demonstrate the evolution of the oceanic crust through Sea Floor Spreading; and ✓ realize the importance of the seafloor spreading process relative to the Continental Drift Theory. What I Know Before you start in this module, kindly assess your understanding of the lesson by answering the Pretest. Directions: Choose the best letter answer in each item. Write your answer in your answer sheet. 1. What evidences do scientists use to support the Continental Drift Theory? A. rocks, fossils, air C. rocks, fossils, climate B. rocks, water, ice D. rocks, fossils, human beings 2. The youngest crust is found _________ the mid-ocean ridge. A. far B. near C. beside D. away 3. If you are a cartographer, what would give you an idea that the continents were once joined? A. ocean depth C. position of the South Pole B. shape of the continents D. size of the Atlantic Ocean 1 CO_Q1_Science10_Module5 4. What discovery provided strong support for Continental Drift Theory? A. Geology C. Electromagnetism B. Fossil evidence D. Paleomagnetism 5. Which is not evidence of seafloor spreading? A. molten magma constantly erupting C. fossil evidence B. drilling samples of rock D. magnetic stripes 6. The magnets point north when Earth's magnetic field has __________. A. magnetic reversal C. mid-ocean ridge B. reversed polarity D. normal polarity 7. Why was Alfred Wegener's Continental Drift Theory not accepted immediately by the people during his time? A. He cannot explain what causes the continents to drift. B. He explains that South America and Africa fit together like a puzzle. C. He described that the rocks and mountains at the edges of the continents were similar. D. He explains that fossils of ancient plants such as "Glossopteris" can be found in almost all continents. 8. Why were magnetic patterns found on the ocean floor puzzling? A. They did not show alternating bands of normal and reversed polarity. B. They showed alternating bands of normal and reversed polarity. C. No rocks were magnetic. D. All rocks were magnetic. 9. What do you call the process that forms and moves new oceanic crust? A. magnetic reversal C. convection B. seafloor spreading D. trenching 10. What do you call the supercontinent landmass formed million years ago? A. Pangaea C. Asia B. Panthalassa D. Eurasia 11. If Australia is moving about 2cm/ year and was drifted from the ridge by 1000km, how long ago was it when Australia was near the ridge? A. 50 million years C. 500 million years B. 10 million years D. cannot be predicted 12. Which one among the continental drift pieces of evidence mainly proves that the Cape Mountains of South America and Africa line up perfectly before? A. There's an equal amount of coal deposits in each continent and fossils. B. The evidence from the rock layers in different continents exactly matched. C. The remains of the ancient plant called Glossopteris can be found on both continents. D. The climate of the two continents is almost the same and with the same ancient organisms. 2 CO_Q1_Science10_Module5 13. What information can be derived about Antarctica having fossils of ancient plants and animals? A. Antarctica drifted to the Southern hemisphere because of the melting of glaciers that traps the plants and animals. B. Antarctica has a very nice climate that caused these organisms to migrate and stay. C. It has a tropical climate today that provides a good environment for complex life forms. D. Antarctica had once located near the equator. 14. He is a German Scientist who hypothesized in 1912 that continents were once a giant landmass called Pangaea. A. Harry Hammond Hess C. Alfred Lothar Wegener B. Robert Dietz D. Charles Darwin 15. What did Harry Hammond Hess realize in the 1950s when his team continued exploring the ocean floor and discovered the Mid-Atlantic Ridge? A. He realized that the oceanic crust is older than the continental crust. B. He realized that Alfred Wegener's Continental Drift Theory is not true. C. He realized that the oceanic crusts near the Mid-Atlantic Ridge are thicker and less dense. D. He realized that the Earth's crust had been moving away on each side of oceanic ridges, down the Atlantic and Pacific Oceans. How was your performance in the pretest? If you got a perfect score, you may skip this lesson or still continue to further enrich your understanding about of the evidence and theories that support the Earth's plate movements. 3 CO_Q1_Science10_Module5 Lesson Evidence of Plate Movements: 1 Continental Drift Theory What's In You have learned so far that Earth has distinct mechanical and compositional layers. This knowledge about the Earth's internal structure came from the indirect observation of our scientists through seismic activities. Scientists learned that as continental and oceanic crusts move, they can form geologic events such as earthquakes, volcanoes, and mountain ranges. What's New Continental Drift Theory Have you seen a world map before? Definitely, yes, you have seen one! Did you notice that the eastern border of South America and the Western part of Africa seem to fit together like a big jigsaw puzzle? Figure: Public Domain Clip Art Image: Blue World Map 4 CO_Q1_Science10_Module5 If you said yes, then you are thinking like Alfred Lothar Wegener (1880-1930), who was a German polar researcher, geophysicist, and meteorologist. He is remembered as the originator of the Continental Drift Theory by hypothesizing in 1912 that the continents are slowly drifting around the Earth and is once a large landmass called Pangaea, a Greek word which means "All Earth." Alfred Lothar Wegener The figure below shows the evolution of the supercontinent Pangaea to the present-day distribution of continents. Can you say that continents are drifting? Figure 1. The Evolution of Pangaea from pubs.usgs.gov Wegener's curiosity about the idea of drifting continents started when he noticed the edges of South America and Africa in a World Map could be fitted like a jigsaw puzzle. 5 CO_Q1_Science10_Module5 Would fitting edges of continents be enough proof that the continents are drifting? What are the other pieces of evidence gathered by Wegener to support his Continental Drift Theory? What is It Evidence Alfred Wegener collected diverse pieces of evidence to support his theory, including geological "fit" and fossil evidence. It is important to know that the following specific fossil evidence was not brought up by Wegener to support his theory. Wegener did not collect the fossils, but he called attention to the idea of using these scientific documents stating there were fossils of species present in separate continents in order to support his claim. Geological "fit" evidence is the matching Illustration showing similar rock of large-scale geological features on different assemblages across different continents. continents. It has been noted that the coastlines of South America and West Africa seem to match up, however more particularly, the rock terrains of separate continents confirm as well. Examples include the Appalachian Mountains of eastern North America linked with the Scottish Highlands, the familiar rock strata of the Karroo system of South Africa matched correctly with the Santa Catarina system in Brazil, and Brazil and Ghana mountain ranges agreeing over the Atlantic Ocean. Glaciers carve rocks and leave marks as they move. In this evidence, scientists can determine the direction of movement of each continent. In addition, the existence of coal deposits in Antarctica suggested that it was once located near the region of the Earth where the climate is enough to support complex life forms such as plants and tall trees. See the figure on the right, notice the direction of the movement of the continents indicated by the arrows during Pangaea time. 6 CO_Q1_Science10_Module5 Look at the map below. It shows how Alfred Wegener mapped-out the distributions of the four Permian and Triassic fossil groups and used it as biogeographic evidence for continental drift and land bridging. Figure 2: Wegener fossils-mapped.png Illustration showing similar rock continents. assemblages across different The Mesosaurus is known to have been a type of reptile, similar to the modern crocodile, which propelled itself through the water with its long hind legs and limber tail. It lived during the early Permian period (286 to 258 million years ago), and its remains are found solely in South Africa and Eastern South America. Now, if the continents were still in their present positions, there is no possibility that the Mesosaurus would have the capability to swim across such a large body of ocean like the Atlantic because it was a coastal animal. Modern-day representation of the Mesosaurus. The now extinct Cynognathus was a mammal-like reptile. Roaming the terrains during the Triassic period (250 to 240 million years ago), the Cynognathus was as large as a modern wolf. Its fossils are found only in South Africa and South America. As a dominant land species, the Cynognathus Modern-day representation of would not have been capable of migrating the Cynognathus. across the Atlantic. 7 CO_Q1_Science10_Module5 The Lystrosaurus, which translates to "shovel reptile," is thought to have been a herbivore with a stout built like a pig. Lystrosaurus fossils are only found in Antarctica, India, and South Africa. Similar to the land-dwelling Cynognathus, the Lystrosaurus would not have had the swimming capability to traverse any ocean. Modern-day representation of the Lystrosaurus. Possibly the most important fossil evidence found in the plant, Glossopteris. The Glossopteris fossil is found in Australia, Antarctica, India, South Africa, and South America—all the southern continents. Modern-day representation of the Glossopteris. Glossopteris seed is known to be large and bulky and possibly could not have drifted or flown across the oceans to a separate continent. Therefore, the continents must have been joined at least one point in time in order to maintain the Glossopteris' wide range across the southern continents. 260 million years old fossilized leaves of glossopteris Description showing the fossil locations of the Mesosaurus, Cynognathus, Lystrosaurus, and Glossopteris spread across different continents. 8 CO_Q1_Science10_Module5 What's More To further understand the idea of Alfred Wegener, perform the activity below to learn about the other Evidence of Plate Movements: Continental Drift Theory. Activity 1: A Journey From The Past To the Future! Let's find out: What is the Evidence of the Continental Drift Theory? Let's use these materials: photocopy of the seven continents, blank globe map, pair of scissors, and world map. Let's do it this way: 1. Use a separate clean paper to write your answers and observation in this activity. 2. Look carefully at the continents on a globe or a world map. 3. Cut out carefully the picture of the landmasses. These cutout-landmasses represent the continents and some of the large islands of the Earth a hundred million years ago. (Note: Before forming "Pangaea," try to place each landmass cut out on top of the present-day World Map to familiarize yourself about the name of each continent and imagine how it drifted to its present location.) 4. In the drawn circle in a separate sheet, construct the supercontinent using the legends as your basis. (Note: Consider the possible location and position of each continent based on the legends before pasting it in the blank globe map.) 5. Answer the following questions: Q1. Do the Glossopteris fossils tell us all landmasses were once joined together? Q2. If Glossopteris fossils were found in Antarctica, what was the climate of this continent before? Q3. If the climate and the position of a place were relative to each other, where then was the initial location of Antarctica 250 million years ago? Q4. Is the presence of animal fossils tells that South America, Africa, and Antarctica were once connected? 6. Examine the giant landmass "Pangaea" and answer the questions below: Q5. What clues are useful in reconstructing Pangaea? Q6. Which continents were obviously neighbors before? Q7. Where do you think was the location of the Philippines in Pangaea during the time when it existed? (Note: Recall the lesson on Convergent Plate Boundaries: Oceanic vs. Oceanic Crust) 7. Now move one continent relative to its current location. Observe the direction of its motion carefully as it assumes it current location and position. Do the same procedure to the other continents. 9 CO_Q1_Science10_Module5 Q8. If the continents will continue to move, try to predict the Philippines' location 25 million years from now. Adapted from https://studylib.net/doc/7058676/continental-drift-lab---cms15-16 10 CO_Q1_Science10_Module5 *Note: This activity sheet must be photocopied Landmasses/ Continents Figure 1. The Evolution of Pangaea from pubs/usgs.gov 11 CO_Q1_Science10_Module5 What I Have Learned You have learned that Alfred Lothar Wegener's curiosity drives him to look for evidence that supports his Continental Drift Theory that continents were once connected as a big landmass called "Pangaea." The Continental Drift Theory is being supported by the following evidence: continental fit, matching of rocks, fossils of ancient organisms, coal deposits in Antarctica, ancient climates, and glaciers carvings. Despite Wegener's gathered evidence supporting his idea about drifting continents during his time, the scientific community rejected him for some problems: Wegener was not a geophysicist, he estimated the speed of continental motion, 250 cm/year, was unbelievably high, and he cannot explain what causes the continents to move. Nevertheless, Alfred Wegener didn't give up and continued his expedition to search for more evidence but later on died. It took many years before his Theory of Continental Drift was accepted. What causes the continents to move to? What can other missing indications be used to support such a claim? Let's find out in the next theory! Let us see if you have understood the essence of the first enrichment activity. Please answer the assessment below. Assessment 1 Directions: Use a separate sheet for your answers. Write only the letter of the correct answer. 1. He was credited for the idea of Continental Drift Theory? A. Alfred Lothar Wegener C. Harry Hammond Hess B. Charles Darwin D. Robert Dietz 2. All continents were once joined together forming a supercontinent called__________. A. Panthalassa B. Laurasia C. Gondwanaland D. Pangaea 3. It is possibly the most important fossil plant evidence that continents are drifting. A. Glossopteris C. Mesosaurus B. Lystrosaurus D. Cynognathus 4. What are the evidence gathered by Alfred Wegener to support his Continental Drift Theory? A. continental fit, rocks, fossils, coal deposits, ancient climate, and glaciers scars B. the ancient climate of Antarctica and Africa C. remains of dead plants and animals D. observing the map 5. What two specific continents fit together most noticeably? A. Africa and North America C. South America and Europe B. South America and Africa D. Antarctica and Africa 12 CO_Q1_Science10_Module5 Lesson Evidence of Plate Movements: 2 Seafloor Spreading Theory What's In You learned from Lesson 1 about the Continental Drift Theory that all continents were once connected into a big landmass called Pangaea, and this was supported by the pieces of evidence gathered by Alfred Lothar Wegener; however, questions such as what causes the continents to move was not logically answered by the theory. In this lesson, you will learn about the Seafloor Spreading Theory that will strongly support the idea that continents are drifting and find out the site of origin of plate movements. What's New Seafloor Spreading and Magnetic Reversal The idea of continental drift circulated in scientific circles until World War II, when sounding gear called SONAR produced new evidence of what the seafloor looked like. The gear, developed in the 1930s, bounced sound waves off the seafloor to determine its depth and features. SONAR beam to navigate and map out the seafloor 13 CO_Q1_Science10_Module5 It happened that the command of one attack transport ship, the USS Cape Johnson, was given to Harry Hammond Hess, a geologist from Princeton University. Hess, then in his late thirties, wanted to continue his scientific investigations even while at war. So he left his ship's sounding gear all of the time, not just when approaching port or navigating a difficult landing. What Hess discovered was a big surprise. Harry Hess, courtesy of Princeton University Archives What did Harry Hess and his men accidentally discover when they explored the oceanic floor? Were they able to locate the start of all the movements on the Earth's surface? Moreover, did the Harry Hess team gather much strong evidence to support the claim that continents are drifting? What is It Ocean floor exploration continued, and by the 1950s, other researchers had found that a huge rift ran along the top of the Mid-Atlantic Ridge. That enabled Hess to understand his ocean floor profiles in the Pacific. He discovered that the bottom of the sea was not as smooth as expected, but full of canyons, trenches, and volcanic sea mountains. He realized that the Earth's crust had been moving away on each side of oceanic ridges, down the Atlantic and Pacific oceans, long and volcanically active. Harry Hess observed that the rate of formation of new seafloor at the mid-ocean ridge is not always as fast as the destruction of the old seafloor at the subduction zone. This explains why the Pacific Ocean is getting Red arrows pointing the Mid- smaller and why the Atlantic Ocean is getting Atlantic Ridge wider. If the subduction zone is faster than the seafloor spreading, the ocean shrinks. He published his theory in History of Ocean Basins (1962), and it came to be called "seafloor spreading." In the early 1960s, dating of ocean-core samples showed that the ocean floor was younger at the Mid-Atlantic Ridge but progressively older in either direction, confirming the reality of seafloor spreading. 14 CO_Q1_Science10_Module5 What's More Perform the next activity to understand further what Harry Hess and his men discover. Activity 2: Where It All Begins? Let's find out: What is seafloor spreading? Let's use these materials: Ages of Oceanic Lithosphere map and diagram of the Mid-Atlantic Ridge and Oceanic Crust Let's do it this way: 1. Get a clean sheet of paper to write down your answers and observation. 2. Examine the thick line in the map below that crosses from Northern to Southern hemispheres. The line represents the Mid-Atlantic Ridge, which is the longest and the most extensive chain of underwater mountains on Earth. Ages of Oceanic Lithosphere in million years The colors in the map indicate the ages of the oceanic rocks per million years. 3. Answer the following questions: Q1. What type of plate movement or boundary is happening in the Mid- Atlantic Ridge? Choose your answer from these types of plate boundaries: convergent divergent transform fault Q2. Before Q1, what molten material will come out from the ridge? Q3. What can you say about the ages of the oceanic rocks near the Mid-Atlantic Ridge? Q4. What can you say about the ages of the oceanic rocks far from the Mid-Atlantic Ridge? 4. The figure below shows the cross-section of the Mid-Atlantic Ridge and the Oceanic Crust. 15 CO_Q1_Science10_Module5 Mid-Atlantic Ridge sediments/oceanic rocks sediments/oceanic rocks 5. Answer the following questions: Q5. What can you say about the thickness of the sediments near the ridge? Choose your answer: thicker or thinner Q6. Before Q5, what can you say about the density of rocks near the ridge? Choose your answer: denser or less dense Q7. What can you say about the thickness of the sediments far from the ridge? Choose your answer: thicker or thinner Q8. Prior to Q8, what can you say about the density of rocks far from the ridge? Choose your answer: denser or less dense 6. The diagram below shows the movement of oceanic crust in the Mid- Atlantic Ridge and the different geologic processes involved. 7. Answer the following question: Q9. If new ocean floor is being formed near the ridge, what will happen to the old oceanic crust materials? Note: recall lesson on types of plate boundaries. _______________________________________________________ Q10. What is the importance of Seafloor Spreading in understanding the origin of the plate movement?______________________________________ Q11. Based on your understanding about seafloor spreading theory, is earth getting larger and wider when plates drift away from each other?_______________________________________________________ Choose your answer: Yes, the Earth gets larger and wider as plates drift. No, the Earth doesn't get larger and wider as plates drift. 16 CO_Q1_Science10_Module5 Assessment 2 Directions: Use a separate sheet for your answers. Write the best letter answer in each item. 1. What can you say about the ages of oceanic crust near and far from the mid- oceanic ridge? A. Oceanic crust is younger near the ridge but older far from it. B. Oceanic crust is older near the ridge but younger far from it. C. Oceanic crust materials have the same ages. D. The Oceanic crust does not age. 2. During World War II, he discovered and proposed that the origin of the plate would be at the mid-oceanic ridge. A. Alfred Wegener B. Harry Hess C. Charles Darwin D. Albert Einstein 3. Describe the thickness of sediments near and far from the mid-oceanic ridge: A. The sediments are thinner near the ridge but thicker as you go far from it. B. The sediments are thicker near the ridge but thinner as you go far from it. C. The thickness of the oceanic sediments near and far from the ridge is the same. D. The sediments are unevenly distributed. 4. What type of plate boundary is occurring in the Mid-Atlantic Ridge? A. Convergent Plate Boundary B. Transform Fault Plate Boundary C. Divergent Plate Boundary D. Destructive Boundary 5. Why is the Earth not getting bigger despite the fact that molten materials are gradually coming out from the mid-oceanic ridge? A. Because everything is being consumed in the subduction zone. B. Because of the faster rate of movement of materials from the ridge. C. Because older oceanic materials are pushed away and slowly consumed in the subduction zone. D. Because the rate of coming out of new oceanic materials and destruction of older oceanic crust are the same. 17 CO_Q1_Science10_Module5 Lesson Evidence of Plate Movements: 3 Magnetic Reversal What's In The Seafloor Spreading Theory contradicts a part of the Continental Drift Theory. The Seafloor Spreading Theory strongly supports that the actual site of plate movements would be in the mid-oceanic ridge. What's New Magnetic Reversal Further evidence came along by 1963, as geophysicists realized that Earth's magnetic field had reversed polarity many times, with each reversal lasting less than 200,000 years. Rocks of the same age in the seafloor crust would have taken on the magnetic polarity at the time that part of the crust formed. Sure enough, surveys of either side of the Mid-Atlantic Ridge showed a symmetrical pattern of alternating polarity stripes. A magnetic compass can tell direction. The needle of a magnetic compass usually points to the North Pole of the Earth, which is actually the South Magnetic Pole at present. The crystalized irons in rocks found in the seafloor act as a magnetic compass that can tell the Earth's magnetic field direction. So, what is magnetic reversal? How can magnetic reversal be used as evidence of the Seafloor Spreading Theory? What is It Seafloor spreading was strengthened with the discovery of the magnetic rocks near the ridge following a pattern aside from the fact that the rocks near the ridge are younger than those farther from the ridge. 18 CO_Q1_Science10_Module5 Symmetrical patterns on each side of the mid-oceanic ridge Magnetic reversal happened many times in the past. The occurrence of the magnetic reversal can be explained through the magnetic patterns in the magnetic rocks. These magnetic patterns allow our scientists to understand the ages and rate of movement of the materials from the mid-oceanic ridge. The magnetic reversal, also called the "magnetic flip" of the Earth, happens when the North Pole is transformed into the South Pole, and the South Pole becomes the North Pole. This event happens because of the changing direction of the flow of materials in the Earth's liquid outer core. Over the last 10 million years, there had been an average of 4 to 5 reversals per million years. New rocks are added to the ocean floor at the ridge with approximately equal amounts on both sides of the oceanic ridge. By the 1970s, geologists had agreed to use the term "plate tectonics" for what had become the core paradigm of their discipline. They used the term "plates" because they had found evidence that not just continents move, but so do whole plates of the Earth's crust. A plate might include a continent, parts of a continent, and or undersea portions of the crust. Alfred Wegener's idea of continental drift had been developed and refined together with the Seafloor Spreading of Harry Hess. What's More To understand further how Earth's magnetic reversal strengthens the Seafloor Spreading Theory, explore the last activity in this module to understand what happens deep under the ocean at the Mid-Atlantic Ridge. Activity 3: The enigmatic Magnetic Reversal Let's find out: What is magnetic reversal? Let's use these materials: Diagram of the Earth's Magnetic Polarity 19 CO_Q1_Science10_Module5 Let's do it this way: 1. Use a clean sheet of paper to write your answer and observation in this activity. 2. Analyze the diagram that shows the Earth's magnetic polarity. The numbers indicate the ages of the oceanic rocks in a million years, while the legend represents the normal-reverse polarity. 3. Answer the following questions: Q1. If magnetic reversals are recorded in the seafloor, what kind of rock is the seafloor made? Note: Materials rise and flow from the mid-oceanic ridge. The material that makes up the seafloor contains magnetic materials such as iron. These solidified irons in the seafloor can act like a little compass needle and follow the Earth's magnetic field. ____________________________________________________________________ Q2. What does the magnetic stripes pattern represent? _______________________________________________________________ Note: Remember that solidified irons in the oceanic rocks can give information about the direction of the Earth's magnetic field. Q3. Is the magnetic stripe pattern on each side of the Oceanic Ridge equal? Q4. Are the ages of rocks on each side of the ridge the same? Let us see if you have understood the purpose of the activity. Please answer the following assessment. What I Have Learned Let's find out what you have learned from our lesson on Sea Floor Spreading and Magnetic Reversal. Can you answer the following questions?  What geologic feature was discovered by Harry Hess and his team in the oceanic crust that stretches from Northern to Southern region?  What can you say about the ages of the oceanic rocks near the Mid-Atlantic Ridge? Do the ages of oceanic rocks get older as you move away from the ridge?  How can Earth's magnetic reversal be used to support Seafloor spreading theory?  What are the lines of evidence that support the plate movement? 20 CO_Q1_Science10_Module5 What I Can Do Most of the changes on the Earth's surface take place so slowly that they are not immediately noticeable by humans. The idea that the Earth's landmasses have broken apart rejoined and moved to other parts of the world forms part of the Plate Tectonic Theory, which you will be exploring in the next module. Since there are strong evidence that continents are drifting as supported by the Continental Drift Theory, Seafloor Spreading, and Magnetic Reversal, can you predict the next movement and locations of the continents 100 million years from now? Is there a possibility that another supercontinent might be formed? Activity: Pangaea Ultima (The Last Supercontinent) Let's find out: How does climate change related to the movement of continents? Let's use these materials: coloring materials (pencil and crayons), short bond paper and a world map showing the present location of the continents and their movement Let's do it this way: 1. Examine the map on the next page. It shows the present location of each continent. The arrows indicate the direction of each plate boundary/ continent. If you can speed up the time 100 million years from now, predict what will be the location of the continents? Will they merge into one supercontinent? Plate Tectonic Process from https://www.astronomynotes.com/solarsys/s8c.htm# 2. Draw your prediction in a separate bond paper. 21 CO_Q1_Science10_Module5 Note: You might want to check this video simulation "How Earth will look in 250 Million Years?" Youtube link: https://tinyurl.com/howearthwilllook250millionyear Remember also that your output in this activity will be rated by your teacher according to the following criteria: Accuracy of Details and Information 5 pts (similar to the shapes of each continent) Techniques (appropriate colors, lines, shapes) 5 pts Neatness of Work 5 pts Total 15pts 3. Answer the following questions: Q1. What can you say about the climate of this "Super Continent"? Q2. Do movements of continents play an important factor in the so called "Climate Change"? Q3. Will this new supercontinent be inhabitable for mankind? Q4. Just for fun, if you can name this Super Continent, what will it be? Why Great job for finishing this module on Evidence of Plate Movements! You are now ready to move forward to the next module! But before that, let's evaluate what you have learned so far from our lessons. Assessment 3 Directions: Use a separate sheet for your answers. Write TRUE if the statement is correct and FALSE if the statement is incorrect. 1. The iron materials found in the seafloor can give information about the Earth's magnetic field direction. 2. The age of rocks that comes out and flow from each side of the oceanic ridge is equal. 3. The magnetic polarity of the Earth remains normal and does not reverse or change. 4. The average distance traveled by the materials from each side of the ridge is the same. 5. A magnetic reversal happens many times in the past. 22 CO_Q1_Science10_Module5 Assessment Directions: Choose the best letter answer in each item. Write your answer in a separate paper. 1. The idea proposed by Alfred Wegener to explain the continental shapes and positions is known as _____. A. Pangaea C. Plate tectonics B. Continental drift D. Seafloor spreading 2. Examine the figure on the right, which two are the best examples of different continental positions in the past? A. North America – South America B. North America – Africa C. South America – Asia Pangaea from Wikimedia Commons D. South America – Africa 3. In the Mid-1900s, scientists mapped mid-ocean ridges using what? A. Satellites B. Moons C. Stars D. Sonars 3. Early observers thought continents might have been joined based on what observation? A. rocks and fossils C. magnetism. B. earthquakes D. coastline 4. Wegener suggested that coal beds discovered in Antarctica indicated that this continent was A. once underwater. C. always frozen. B. once near the equator. D. part of Africa 5. In the figure above, what is the age of the seafloor off of the Bahamas? A. younger than 9.6 million years C. 33.0 – 83.0 million years B. 9.6 – 33.0 million years D. 83.0 – 141.9 million year Study the Mid-Atlantic figure to answer items 6-7 6. In the figure above, what is the approximate age of the seafloor off the north coast of Spain? A. younger than 9.6 million years C. 33.0 – 83.0 million years B. 9.6 – 33.0 million years D. 83.0 – 141.9 million years 23 CO_Q1_Science10_Module5 7. Peer scientists reviewing Wegener's hypothesis of continental drift rejected his notion because____________. A. his evidence was too few to make a valid conclusion. B. he did not explain how continents move and what moves them. C. his evidence was not clear in showing how continents were joined. D. he lied by including false evidence. 8. ___________ help explain why Earth is not getting any larger even though the tectonic plates are always moving. A. Earthquakes C. Subduction zones B. Fossils D. Volcanoes 9. If there are MORE mid-ocean ridges than subduction zones, what happens to the ocean? A. It gets larger. C. It gets smaller. B. It sinks. D. Nothing will change. 10. What do ancient glacier scars found in rock surfaces in Africa tells about its climate in the past? A. The continents have not moved. B. Africa has always been near the equator. C. Africa was once in an area of the Earth that had a very cold climate. D. Africa was once covered with ice sheets but did not move ever since. 11. Which of the following increases with distance from the mid-oceanic ridge? A. The age of oceanic lithosphere. C. The thickness of the lithosphere. B. The density of oceanic lithosphere. D. All (A, B, & C) 12. The Seafloor Spreading Theory states that ________________. A. all continents are drifting. B. ages of rocks near a ridge are older than the ones far from it. C. fossils of plants and animals are found in almost all continents. D. hot and less dense material from below the Earth's crust rises towards the surface at the mid-oceanic ridge. 13. What can you say about the rate of movement of materials coming out from the mid-oceanic ridge and the materials sinking in the subduction zone? A. The rising of the materials from the ridge is slower than in the subduction zone. B. The movement of the materials in both ridge and subduction zone is the same. C. The rising of the materials from the ridge is faster than in the subduction zone. D. There is no much movement of materials happening in both the ridge and subduction zone. 14. What strong evidence discovered by our scientist that Earth's magnetic reversal had been happening in the past? A. The magnetic reversal occurrence is supported by magnetic patterns in magnetic rocks found on the ocean floor. B. The ages of the rocks on the ocean floor are constantly changing. C. The magnetic field of the Earth becomes weaker. D. The Earth's magnetic field is fluctuating. 24 CO_Q1_Science10_Module5 Additional Activities Note: This is an optional activity. You may ask your teacher for help in accessing the video links. To remember more about Alfred Wegener and Harry Hess works, you might want to sing the song "Wegener was his name" by Mr. Parr to the tune of the song "One-call away" from Youtube.com. Here is the link to that song: https://tinyurl.com/wegenerwashisname Wait, there's more! You might want to sing this song too "Pangaea's Moving Farther Apart Again Song," link: https://tinyurl.com/pangaeamovingpartagain Have fun, and enjoy singing! How I Rate My Self… Before you return this module to your teacher, kindly copy and fill out the Self-rating table adapted from Valdoz (2017). How much did this module help Fair Good Excellent you… (5pts) (8 pts) (10 pts) Explain the Continental Drift Theory? Identify the pieces of evidence of Continental Drift Theory? Explain the Seafloor Spreading Theory? Identify the pieces of evidence of Seafloor Spreading Theory? Explain magnetic reversal? Predict the next movement of the continents? 25 CO_Q1_Science10_Module5 CO_Q1_Science10_Module5 26 Activity 1: A journey from the past to future! Q1. Yes Q2. Temperate Q3. Near equator Assessment 1 Q4. Yes 1. A Pre-assessment Q5. Shapes, fossils, rocks (basalt), sand 2. D 1. C Q6. Africa and South America 3. A 2. B Q7. Philippines did not exist during the time 4. A 3. B of Pangaea (recall oceanic vs. oceanic 5. B 4. B convergent boundary) 5. C Q8. Philippines might be moving eastward 6. D 7. A Activity 2: Where it all begin? Q1. Divergent boundary Assessment 2 8. B 1. A Q2. Magma or lava 9. B 2. B Q3. Younger oceanic rocks 10.A Q4. Older oceanic rocks 3. A 11.A Q5. Thinner sediments near the ridge 4. C 12.B Q6. Less dense oceanic rocks 5. C 13.D Q7. Thicker sediments far from the ridge 14.C Q8. Denser oceanic rocks 15.D Q9. It will be pushed away and destroyed at the subduction zone (recall convergent plate boundary) Assessment 3 Post-Assessment Q10. Seafloor Spreading is a process that 1. True 1. B occurs at mid-ocean ridges, where new 2. True 2. D oceanic crust is formed through 3. False 3. D volcanic activity and then gradually 4. True 4. D moves away from the ridge. 5. True 5. B Q11. No, earth doesn’t get larger and wider 6. D as plates drift. 7. D 8. B Activity 3: The enigmatic Magnetic 9. C Reversal 10.A Q1. Magnetite / Magnetic rocks/ rocks 11.C containing irons 12.D Q2. Magnetic stripes patterns represent the 13.D direction of the earth’s magnetic polarity. 14.C Q3. Yes 15.A Q4. Yes Answer Key References Printed Materials: Department of Education, Bureau of Secondary Education. Learner's Material, Unit 1. Department of Education, Bureau of Secondary Education. Teacher's Guide, Unit 1. Valdoz, Meliza P., et al. 2017. Science Links 10. Manila, Philippines: Rex Bookstore, Inc. Electronic Sources: A model of seafloor spreading from https://tinyurl.com/yxb5zcat Age of oceanic lithosphere – Hebrew from https://commons.wikimedia.org/wiki/File:Age_of_oceanic_lithosphere_heb.j pg Alfred Wegener from https://commons.wikimedia.org/wiki/File:Alfred_Wegener_ca.1924-30.jpg Alfred Wegener: Building a Case for Continental Drift from http://publish.illinois.edu/alfredwegener/evidence/ publish.illinois.edu © 2019 University of Illinois Board of Trustees Collecting Multibeam Sonar Data by National Ocean Service from flickr.com Attribution 2.0 Generic (CC BY 2.0) Diagram Earth's Magnetic Polarity by Marianne Soriano Diagram Mid-Atlantic Ridge and Sediments/Rocks by Marianne Soriano Diagram Mid-Atlantic Ridge and Subduction Zone by Marianne Soriano Diagram Symterical Patter by Marianne Soriano Dosya: Atlantic bathymetry.jpg from https://diq.m.wikipedia.org/wiki/Dosya:Atlantic_bathymetry.jpg File: East Pacific Rise seafloor magnetic profile - observed vs. calculated.png from https://commons.wikimedia.org/wiki/File:East_Pacific_Rise_seafloor_magne tic_profile_-_observed_vs_calculated.png File:Wegener fossils-mapped.png from https://en.m.wikipedia.org/wiki/File:Wegener_fossils-mapped.png Fossilized Leaves of Glossopteris from https://www.therockgallery.co.uk/fossil-leaves-of-glossopteris-----260-million- years-old-----australia-1838-p.asp Globe World Map - Free vector graphic on Pixabay from https://images.app.goo.gl/q6qXHZ4ZVPPKiRq8A 27 CO_Q1_Science10_Module5 News | NASA Study Goes to Earth's Core for Climate Insights from https://images.app.goo.gl/gBPwo7siDuAVmv1i8 Pangaea italiano.png from Wikimedia Commons Attribution CC0 1.0 Universal (CC0 1.0) Public Domain Dedication Pangaea's Moving Farther Apart Again Song by Mr. Parr from https://tinyurl.com/pangaeamovingpartagain Patterns of Magnetic Polarity Reversals by Earth Science-Tucky from https://msu.edu/~tuckeys1/highschool/earth_science/magnetic_reversals.pdf Permian–Triassic extinction event from https://images.app.goo.gl/qjJ6oV4PAXsJT9Gz7 Plate Tectonic Process by Nick Strobel from https://www.astronomynotes.com/solarsys/s8c.htm# Planetary Science from https://images.app.goo.gl/9HnKUyyaUbQoGWAj6 Seafloor spreading from https://www.nationalgeographic.org/encyclopedia/seafloor-spreading/ Wegener was his name by Mr Parr from https://www.youtube.com/watch?v=ME4B9aMLcZ0 28 CO_Q1_Science10_Module5 For inquiries or feedback, please write or call: Department of Education - Bureau of Learning Resources (DepEd-BLR) Ground Floor, Bonifacio Bldg., DepEd Complex Meralco Avenue, Pasig City, Philippines 1600 Telefax: (632) 8634-1072; 8634-1054; 8631-4985 Email Address: [email protected] * [email protected]

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