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Deserts and the Tundra: Permafrost

Grade Levels: 3 - 12
Length: 00:00:11
Website: http://www.uen.org/emedia
Usage rights: Download and retain personal copies in perpetuity.

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Permafrost is the phenomenon by which only thin layers of the upper soil in the arctic tundra thaw, while the lower layers remain permanently frozen.

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