Fotod Gröönimaa rahvuspark

Permafrost patterns of tundra soil, Northeast Greenland National Park, autor GRIDArendal

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 polygonal patterns that mark the surface of permafrost. These features, commonly found in areas of both permafrost and seasonal frost, are formed by contraction cracks enlarged by ice wedges. For any form of publication, please include the link to this page: <a href="http://www.grida.no/resources/3613" rel="nofollow">www.grida.no/resources/3613</a> This photo has been graciously provided to be used in the GRID-Arendal resources library by: Peter Prokosch
Gröönimaa rahvuspark on rahvuspark Gröönimaal, mis hõlmab saare põhja- ja kirdeosa. Pindalaga 972 000 km² on see maailma suurim rahvuspark. Loodes ulatub rahvuspark Petermanni liustikuni, kagus Kuningas Oscari fjordini ja Rypefjordini. Loe edasi
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