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Science Grade 10 Unit 3: Earth’s Internal Structure LESSON 3.1 The Crust Table of Contents Introduction 1 Learning Competency...

Science Grade 10 Unit 3: Earth’s Internal Structure LESSON 3.1 The Crust Table of Contents Introduction 1 Learning Competency 2 Learning Objectives 2 Warm-Up 2 Learn about It 5 The Crust 5 Abundant Elements on Earth’s Crust 6 Oxygen 7 Silicon 7 Aluminum 7 Iron 7 Types of Earth’s Crust 7 Formation of Earth’s Crust 10 Key Points 11 Check Your Understanding 11 Bibliography 12  Science Grade 10 Unit 3: Earth’s Internal Structure Lesson 3.1 The Crust Planet Earth Introduction Life can be found almost anywhere on Earth—deep under the ocean, in forests, plains, mountains, volcanoes, and more. Scientists have even proven that there is life, in the form of bacteria and fungi, present in clouds. 1  Science Grade 10 Unit 3: Earth’s Internal Structure As ubiquitous as life may seem, not all parts of Earth can house living organisms. Animals, plants, fungi, bacteria, and other life forms can only thrive in the layer of Earth known as the crust. What is the crust? What are the other layers of Earth? Learning Competency At the end of this lesson, the given DepEd learning competency should be met by the students. Describe the internal structure of the Earth (S10ES –Ia-j-36.4). Learning Objectives In this lesson, you should be able to do the following: Describe Earth’s crust. List the abundant elements in Earth’s crust. Identify the two types of Earth’s crust. Explain how Earth’s crust is formed. Warm-Up Egg-ARTH Materials hard-boiled chicken egg metal knife newspaper 2  Science Grade 10 Unit 3: Earth’s Internal Structure Procedure 1. Examine the texture of the shell of a hard-boiled chicken egg. 2. Slice the egg in half. Make sure not to crack the eggshell. Examine the thickness of the shell relative to the thickness of the egg white and egg yolk. A sliced egg 3. Carefully remove the shell. Examine its hardness. Crack the shell into at least two pieces and compare the thickness of each piece with another. 4. Set aside the halved egg on a newspaper. 5. Record your observations in the unshaded cells (eggshell only) and answer the guide questions afterward. Note that the shaded cells of the table will be completed in the succeeding lessons of this unit. Observation Table Table 3.1.1. Observations on the characteristics of the chicken egg layers. Observed quality Eggshell Egg white Egg yolk Texture Thickness Hardness 3  Science Grade 10 Unit 3: Earth’s Internal Structure Elasticity Outermost/middle layer/innermost Comparable model to a layer of Earth Guide Questions 1. In terms of texture, is the eggshell smooth or rough? __________________________________________________________________________________________ __________________________________________________________________________________________ 2. In terms of hardness, is the eggshell rigid or elastic? __________________________________________________________________________________________ __________________________________________________________________________________________ 3. What can you say about the thickness of the shell compared to the other parts of the egg? __________________________________________________________________________________________ __________________________________________________________________________________________ 4. Is the thickness of each piece of eggshell equal to each other? Are there thicker or thinner pieces? __________________________________________________________________________________________ __________________________________________________________________________________________ 5. Do you think that the eggshell is an acceptable model for Earth’s crust? Why or why not? __________________________________________________________________________________________ __________________________________________________________________________________________ 6. What are the similarities between Earth’s crust and an eggshell that you can think of? __________________________________________________________________________________________ __________________________________________________________________________________________ 4  Science Grade 10 Unit 3: Earth’s Internal Structure Learn about It Essential Questions What are the different layers of Earth? How is the crust different from other layers of Earth? The Crust The crust is the outermost layer of the geosphere. It is made up mostly of solid rocks and minerals and is enriched in silica and other components. It is extremely thin, compared to the other layers, and its thickness varies from 5 to around 80 km depending on where you are on the planet. The crust accounts for