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| zone that has the most of earths mass |
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| theory that explains how forces within the planet create land forms |
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| plates move slowly, less than one inch per year across the upper mantle |
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| crust stretches until it breaks |
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| thick layer of mud and clay has buried all other features |
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| where the continental surface extends under the shallow ocean water |
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| a deep valley, marking where a plate collision |
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| places where rock has been compressed into bends |
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| places where rock masses have been broken apart and moved away from each other |
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| when rocks break down and decay over time |
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| small particles of gravel, sand, and mud |
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| movement of surface material from one location to another |
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| elevated flatland that rises sharply above nearby land at least on one side |
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| fan shaped deposit of mud and gravel at the bases of mountains |
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| collection of sediment at the mouth of a river |
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