Lesson 175 of 500 · Extra Passages

Earth Layers Part 3

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Earth Layers is studied by students all over the world. It is a key part of the curriculum. Teachers explain Earth Layers using examples and activities. With practice, anyone can understand Earth Layers well. As students advance, they learn more details about Earth Layers. Practice and review help strengthen understanding.

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Question 1

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What is the main topic of this passage?