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Lesson 1:
What Are Earth's Four Systems?
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Lesson 2:
How Do Earth's Systems Produce Weather and Climate?
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Lesson 3:
How Do Earth's Systems Change Earth's Surface?
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Lesson 4:
How Do Farming and Industry Affect Earth's Systems?
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Lesson 5:
How Do People's Everyday Lives Affect Earth's Systems?
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Lesson 6:
What Can People Do to Protect Earth's Systems?
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