Science 9 3rd Summative Test 2024-2025 PDF

**Multiple Choice**. Choose the letter of the best answer. Write your answer in a separate sheet of paper. *A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovol...

**Multiple Choice**. Choose the letter of the best answer. Write your answer in a separate sheet of paper. *A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and explosive eruptions. Some have collapsed summit craters called calderas. The lava flowing from stratovolcanoes typically cools and solidifies before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high to intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less viscous mafic magma. Extensive felsic lava flows are uncommon, but can travel as far as 8 km (5 mi).* Which of the following is **NOT** true about composite volcano? A. it consists of high silica C. it is asymmetrical in shape B. it is steep D. it releases viscous magma The higher the silica content characterized by the composite volcano, the \_\_\_\_\_\_\_\_\_\_\_its viscosity. A. faster C. lower B. greater D. same How does the composition of magma affect the type of volcanic eruption? A. Magma has no effect on the type of volcanic eruption. B. Magma with a low silica tends to produce explosive eruptions. C. Magma with a high silica tends to produce explosive eruptions. D. The effect of magma composition on the type of volcanic eruption depends on the temperature and pressure of the magma. Which is **NOT** a characteristic of an active volcano? A. with records of eruption B. erupted 10,000 years ago C. have not erupted for the last 10,000 years D. with records of eruption within the last 600 years Which are considered active volcanoes in the Philippines? I. Mayon Albay III. Kanlaon in Negros Island II\. Calayan in Cagayan IV. Hibok-hibok in Camiguin A. I and II only C. I, II, and IV only B. I, II, and III only D. I, III, and IV only The eruption of Mount Pinatubo in the Philippines on June 15, 1991, was the second largest of the 20th century. Its eruption was characterized as an excessively explosive type of eruption of gas and pyroclastic. Which type of the eruption is this? A. Phreatic C. Plinian B. Phreatomagmatic D. Strombolian Which of these is TRUE for a Phreatomagmatic eruption? A. It is a silent eruption due to oozing lava B. Its eruption is characterized by fountain lava. C. Its eruption has resulted to sideway emission of pyroclastic. D. It is a short-lived eruption and maybe an onset of a major eruption. What is the most important sign of an impending volcanic eruption which is also referred as seismic activity? A. crater glow C. volcanic tremor B. ground swell D. dried vegetation Which of these is **NOT** a sign of a forthcoming volcanic eruption? A. crater glow C. drying up of vegetation B. volcanic tremors D. increased amount of rainfall Which type of volcanic eruption is characterized by intermittent explosive bursts of lava and gas that create a fountain-like eruption column? A. Hawaiian eruption C. Vulcanian eruption B. Strombolian eruption D. Plinian Taal volcano in Batangas exhibits phreatic or hydrothermal eruption. Which of the following statements describes a phreatic eruption? A. It is an eruption due to the contact between water and hot rocks. B. It is an excessively explosive type of eruption of gas and pyroclastic. C. It is a periodic weak violent eruption characterized by fountain of lava. D. It is characterized by tall eruption columns that reach up to 20 km high with pyroclastic flow and ash fall tephra. Which statement shows the difference between a volcano and a mountain? A. Volcanoes are taller than mountains. B. Mountains can erupt, while volcanoes cannot. C. Volcanoes are associated with eruptions while mountain don't. D. Mountains are made up of solid rock, while volcanoes are made up of loose material. Dr. Andrew is studying how Mt. Mayon, a nearby volcano, erupts. He noticed that in the past eruptions, this volcano released large lava flows, pyroclastic deposits, mudflow deposits, as well as lava domes. What type of volcano is Mt. Mayon? A. cinder volcano C. composite volcano B. shield volcano D. marine volcano **What part of the volcano serves as the region under the surface of the Earth where hot molten magma is collected?** **A. lava flow C. main vent** **B. magma chamber D. secondary vent** **What is the term used to represent the opening of the volcano where magma comes out?** **A. chamber C. summit** **B. crater D. vent** What type of magma has highest silica contents and characterized by explosive eruption? A. Andesitic Magma C. Mafic Magma B. Basaltic Magma D. Rhyolitic Magma Which statement is **TRUE** regarding the effect viscosity on the gas content? A. The higher the viscosity, the higher its gas content B. The higher the viscosity, the lesser its gas content C. The lower the viscosity, the higher its gas content D. The lower the viscosity, the more its gas content How does magma viscosity affect volcanic eruptions? A. Lower viscosity magma results in more explosive eruptions. B. Higher viscosity magma results in more explosive eruptions. C. Volcanic eruptions is not dependent on the type of magma. D. There is no effect between magma viscosity and volcanic eruptions. Several kilometers from a volcano, a geologist observes an old lava flow made up of dark- colored basalt rock. The geologist infers that the lava must have had\_\_\_\_\_\_\_\_\_\_\_\_. A. high viscosity C. low viscosity B. high silica content D. medium viscosity Which type of lava will offer the least resistance to flow? A. Andesitic C. Basaltic and Rhyolitic B. Basaltic D. Rhyolitic The magma in the chamber of a volcano has a very high amount of silica. If the volcano would erupt, which might happen? A. The lava would flow very slowly B. The volcano would erupt violently C. The volcano would erupt non-explosively D. There would be a build-up of pressure below the crater Which type of magma has the lowest chemical and gas content? A. Andesitic C. Rhyolitic B. Basaltic D. None of the choices Based on the given data about the gas and silica contents of magma, what would be the correct arrangement of the three types of magma if you are to arrange them in an increasing order of explosiveness? A. Andesitic, Rhyolitic, Basaltic C. Basaltic, Rhyolitic, Andesitic B. Basaltic, Andesitic, Rhyolitic D. Rhyolitic, Andesitic, Basaltic Which is the **CORRECT** order of the volcanic eruption and materials emission? I. Gas bubbles are trapped causing the molten material to swell. II\. Pressure exceeds resulting to formation of more gas bubbles. III\. Gas bubbles are developed. IV\. Magma inside the volcano is heated and goes up. V. Lava, rock, lava bombs, ash and dust ejected from volcano. A. I, II, III, IV, V C. III, IV, I, II, V B. III, IV, II, I, V D. IV, III, II, I, V A volcanic eruption occurred in a remote island in the Pacific Ocean. Scientists are studying the process of the eruption to understand its characteristics and predict future volcanic activity. What is volcanic eruption? A. Lava cools and solidifies, magma rises to the surface, gases escape from the magma, an explosion occurs. B. Magma rises to the surface, gases escape from the magma, an explosion occurs, lava cools and solidifies. C. Gases escape from the magma, an explosion occurs, magma rises to the surface, lava cools and solidifies. D. Magma rises to the surface, an explosion occurs, gases escape from the magma, lava cools and solidifies. Why is the Philippines the best place to build geothermal power plants? A. Because Philippines is a rich country. B. Because the temperature in the Philippines is too hot. C. Because the Philippines is in the of Pacific Ring of Fire. D. Because there is lesser chance that an earthquake might happen. Which of the following is an environmental advantage of geothermal energy? II\. It doesn\'t require the use of fossil fuels. III\. It doesn\'t generate greenhouse gas emissions. A. I and II B. I and III C. II and III D. I, II, and III Which type of volcano is most commonly associated with geothermal energy? A. Active volcanoes C. Effusive volcanoes B. Dead volcanoes D. Inactive volcanoes What volcano is tap as a source of geothermal energy in Laguna? A. Taal B. Mayon C. Pinatubo D. Makiling What is the primary source of electrical energy in a geothermal power plant? A. Fossil fuels C. Solar panel B. Heat beneath the earth's surface D. Wind turbines How is electrical energy generated in a geothermal power plant? A. By burning fossil fuels B. By using wind turbines C. By converting solar energy into electricity D. By converting heat from the earth\'s crust into steam to turn turbines connected to a generator The following are the advantages of geothermal energy **EXCEPT**. A. It is a natural source of energy. B. It does not produce more pollution. C. It does not use fossil fuel to operate. D. It is only available in certain locations. How can geothermal energy be used for heating buildings and homes? A. By using natural gas C. By using geothermal heat pumps B. By burning of wood D. By installing solar panels on the roof What are some common ways that electrical energy from geothermal power plants can be utilized for human use? I. Powering electric vehicles II\. Heating homes and buildings III\. Generating electricity for industrial processes. A. I and II B. I and III C. II and III D. I, II, and III  What is the process by which a geothermal power plant produces electricity? A. Hot air and steam are used to turn a turbine, which generates electricity. B. Cold air and steam are used to turn a turbine, which generates electricity. C. Hot water and steam are used to turn a turbine, which generates thermal energy. D. Cold water and steam are used to turn a turbine, which generates mechanical energy. How is geothermal energy harnessed as source of electricity? A. Wells are drilled on Earth's surface to pump steam or hot water B. The steam from hot water spins the turbine to produce electricity C. The turbines are connected to generators that generates electricity D. All of the above What is the advantage of a geothermal power plant? A. Renewable resources C. Can cause surface instability B. High temperature is required D. Suited only in particular region How are climate and weather different? A. Climate and weather are not different. B. Weather is the accumulation of climate over time. C. Climate is the variability in the amount frost-free days on an annual basis. D. Climate is long term weather conditions and weather is the state of the atmosphere at a place and time. Which shows the correct sequence of the flow of energy in a Geothermal Power Plant? Can geothermal energy be used to generate electricity in all parts of the world? A. No, geothermal energy cannot be used to generate electricity. B. Yes, Geothermal energy can be used to generate electricity using solar energy. C. Yes, geothermal energy can be used to generate electricity anywhere in the world. D. No, geothermal energy can only be used to generate electricity in certain parts of the world where there is enough geothermal heat. The shape and feature of land surface that gives precipitation and dry air is what factor affecting climate? A. Altitude B. Latitude C. Ocean current D. Topography Factors that affect climate are the following EXCEPT: A. distance from the equator C. proximity to large body of water B. ocean and wind currents D. surface area What factor greatly affects the climate in Tagaytay, Cavite? A. Altitude C. proximity to large body of water B. latitude D. topography What happens to water vapor as it rises over the mountain? A. As air rises over mountains, it heats up and disperse. B. As air rises over mountains, it heats up and evaporates. C. As air rises over mountains, it cools and water vapor evaporates. D. As air rises over mountains, it cools and water vapor condenses. Which side of the mountain experiences low temperature. A. Both sides B. Leeward side C. Center D. Windward side What happens to air as it moves toward the leeward side? A. Air becomes warmer and drier while it moves down the leeward side of the mountain. B. Air becomes cooler and wet while it moves down the leeward side of the mountain. C. Air becomes cooler and drier while it moves down the leeward side of the mountain. D. Air becomes warmer but wet while it moves down the leeward side of the mountain. Baguio City is considered the \"Summer Capital of the Philippines" due to its cool mountain weather because of its altitude. How does altitude relate with the temperature of a place? A. As altitude increases, temperature increases. B. As altitude increases, temperature decreases. C. As altitude increases, temperature remains the same. D. As altitude increases, temperature varies from time to time.