Permafrost
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- Permafrost Layer of soil or rock, at some depth beneath the surface, in which the temperature has been continuously below 0 °C for at least some years. It exists where summer heating fails to reach the base of the layer of frozen ground.
NSIDC - Cite This Source - This Definition - Blizzard, Depth of snow, Drifting snow, Landfill, Mixed precipitation, precipitation, Sleet, Snow cover, Snowstorm