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Permafrost patterns of tundra soil, Bear Islands, Ofjord, Northeast Greenland National Park

Permafrost patterns of tundra soil, Bear Islands, Ofjord, Northeast Greenland National Park

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Uploaded 29 Sep 2014 by Peter Prokosch
Year: 2014 Taken by: Peter Prokosch
Ice wedges grow as the ice-rich frozen ground contracts during the winter and forms open cracks below the surface. As the ground surface warms and the snow thaws in the spring, meltwater flows into the open cracks and freezes. But the ground beneath is still frozen, and as the freezing water expands, it forces the surrounding soil upward and outward. This process creates the ridges and troughs typically seen on either side of the ice wedges. Networks of ice wedges form the distinctive pol ...
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