In permafrost regions,the topmost portion of ground that undergoes thawing and freezing is the
A) transition zone.
B) thermokarst.
C) discontinuous layer.
D) frost zone.
E) active layer.

Question

Quizplus · Accepted Answer

The topmost portion of ground that undergoes thawing and freezing in permafrost regions is known as the active layer. It is the layer that thaws during the summer months and freezes during winter.

In Permafrost Regions,the Topmost Portion of Ground That Undergoes Thawing