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Encyclopedia > Periglacial

Periglacial refers to places in the edges of glacial areas, normally those related to past ice ages rather than those in the modern era.


Periglacial conditions in the Pleistocene created landscapes and geological conditions moulded by frost action, the repeated freezing and thawing of material over long periods of time. Around a third of the earth's land surface can be considered as having been subject to periglacial conditions.


The conditions result in a variety of ground conditions but especially those involving irregular, mixed deposits created by ice wedges, solifluction, gelifluction, frost creep and rockfalls.


  Results from FactBites:
 
Periglacial Landform (886 words)
A periglacial landform is a feature resulting from the action of intense frost, often combined with the presence of PERMAFROST.
Periglacial environments exist not only in high latitudes and tundra regions but also in areas south of the treeline and in high altitude (alpine) regions of temperate latitudes.
Pingos are not typical of all periglacial landscapes but result from specific geomorphic and hydrologic conditions that severely limit their occurrence.
10(ag) Periglacial Processes and Landforms (3288 words)
This definition suggests that in a periglacial environment the effects of freezing and thawing drastically modify the ground surface.
Surface soils and sediments in periglacial environment are frequently influenced by a variety of different types of ground ice.
The surface of periglacial areas is often characterized by the presence of ground materials arranged in a variety of symmetrical, geometric shapes (Figures 10ag-6 and 10ag-7).
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