Question

How will you identified an active layer?​

Answer 1

Answer:

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Explanation:

The active layer, in general terms, represents the upper layer of soil or rock that is subject to annual freezing and thawing in areas underlain by permafrost (Fig. 5). Pragmatically, however, the active layer is thermally defined, such that its base occurs at the depth of maximum seasonal penetration of the 0°C isotherm into the ground (Burn, 2004). Active-layer thickness varies substantially. The thinnest active layers may be as little as a few centimeters in the coldest regions of continuous permafrost at high elevation near the polar plateau in Antarctica. The thickest are 10 m or more in relatively warm regions of discontinuous permafrost, for example in the mountains of northern Norway, where the mean annual ground temperature at 10 m depth is close to 0°C and the bedrock is relatively dry.