Patterned ground is the distinct, and often symmetrical geometric shapes formed by ground material in periglacial regions. Typically found in remote regions of the Arctic, Antarctica, and the Australian outback, but also found anywhere that freezing and thawing of soil alternate; patterned ground has also been observed on Mars. The geometric shape...
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http://en.wikipedia.org/wiki/Patterned_ground
Term used to describe a number of surface features found in periglacial environments. These features can resemble circles, polygons, nets, steps, and stripes. The development of some of these shapes is thought to be the result of freeze-thaw action.
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http://www.physicalgeography.net/physgeoglos/p.html
a general term for any ground surface exhibiting a discernibly ordered, more or less symmetrical, morphological pattern of ground and, where present, vegetation. A photograph taken from the air reveals patterned ground surrounding thaw lakes in Alaskas Arctic National Wildlife Refuge. Credit: U.S. Fish and Wildlife Service
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https://nsidc.org/cryosphere/glossary?page=18
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