low-centre polygon

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low-centre polygon

ice wedge

Also known as: raised-edge polygon

Learn about this topic in these articles:

permafrost

In permafrost: Polygonal ground
…the centre and are called low-centre polygons or raised-edge polygons and may contain a pond in the centre. Low-centre, or raised-edge, polygons indicate that ice wedges are actually growing and that the sediments are being actively upturned. If erosion, deposition, or thawing is more prevalent than the up-pushing of the…
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