Answer
Solifluction in the Arctic occurs during the warmer summer season. In the Arctic, the ground is usually frozen in winter due to permafrost. During the summer, the top layer of the permafrost thaws, creating a layer of saturated soil called the active layer. The underlying permafrost acts as an impermeable layer, preventing water from draining downward. As a result, the active layer becomes waterlogged and behaves like a fluid, slowly flowing downslope due to gravity. This process of solifluction is more prevalent during the warmer summer months when the ground thaws, allowing the saturated soil to flow downslope.
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