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| area of high,flat land with steep sides |
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| ridge of sand, rock, or coral that lies at or near the surface of a sea or ocean |
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| large stream of water that flows across the land |
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| body of salt water smaller than an ocean |
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| level even with the surface of an ocean or a sea |
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| side of a hill or mountain |
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| place where a river begins |
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| narrow channel of water connecting two larger bodies of water |
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| area of low, wet land with trees |
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| line on a mountain above which it is too cold for trees to grow |
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| stream or river that empties into a larger river |
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| low land between hills or mountains |
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| opening in the Earth, often raised, through which lava, rock, ashes, and gases are forced out |
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| steep drop in a stream or river |
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