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CATEGORY: geography
DEFINITION: An almost treeless region adjacent to polar ice; the region between ice caps and the tree line in lower Arctic latitudes. All but the top few inches of soil are permanently frozen, and so only a few plants can grow - mosses, lichens, sedges, grasses, and stunted shrubs. There are two types: on level or rolling ground in polar regions (arctic tundra) or on high mountains (alpine tundra).

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