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| a physical feature on Earth's surface |
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| the gases that surround Earth |
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| the rocky, outermost layer of Earth's surface |
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| the layer of Earth below the crust |
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| the scientific theory that Earth's crust is made of moving plates |
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| an opening in Earth's crust through which melted rock may flow |
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| a fixed pool of magma in the mantle that melts through a tectonic plate |
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| a sudden shaking of Earth's crust |
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| the point on Earth's surface just above the focus |
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| a large wave that is often caused by an earthquake under the ocea |
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| the breaking down of rocks into smaller pieces |
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| the movement of weathered rock |
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| a mass of ice that moves slowly over land |
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| the process of dropping off weathered rock |
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| a bend, or S-shaped curve, in a river |
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| bits of soil or rock that may be eroded and deposited |
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