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4 Cards in this Set
- Front
- Back
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permafrost
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permanently frozen layer of ground below the top layer of soil
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prairie
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a region of flat rolling land covered with tall grass
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hydroelectricity
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electric power produced by moving water, usually generated by releasing water from a dam across a river.
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Revolutionary war
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the war in witch the American colonies won their independence from Britain, fought from 1775-1781
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