Glacial Landform, Permafrost, patterned ground, solifluction deposits, and pingos
Permafrost is ground that remains perennially frozen (see permafrost). It covers about 20 - 25 percent of the Earth's land surface today. The �active layer� of soil close to the surface of permafrost regions undergoes many seasonal and daily freeze-thaw cycles. The constant change in the volume of water tends to move the coarser particles in the soil to the surface. Further
posted by SharpBranch @ 11:12 AM
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