Through the process of frost cracking, periglacial surfaces may exhibit polygonal areas of ground separated by cracks. If these cracks fill with debris, the ground rises around the wedges when the permafrost expands. These are sand-wedge polygons. In more humid environments, if the cracks are filled with ice, the feature is an ice-wedge polygon.
polygons
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 | What shapes are polygons and non polygons? Read answer... |
| What is an equilateral polygon that is not a regular polygon? Read answer... |
| What makes a polygon a polygon? Read answer... |
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 | Geography Dictionary. A Dictionary of Geography. Copyright © Susan Mayhew 1992, 1997, 2004. All rights reserved. Read more |
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