Tundra
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Tundra are the treeless plains of the artic circle. The soil is a thin coating over permafrost. For most of the year the temperature never gets above freezing, and even during the short summer doesn't rise above 50 degrees (F).
Typical tundra vegation includes lichens, mosses, and stunted shrubs.
Sources
The New American Desk Encyclopedia, Penguin Group, 1989