What is happening to the hillside in the tundra pictured below?

Question

Quizplus · Accepted Answer

The slow movement and deformation of the hillside in the tundra pictured below is due to solifluction. Solifluction is a type of soil movement that occurs in areas with permafrost. In warmer seasons, the top layer of soil thaws and becomes saturated with water, causing it to slide over the frozen ground below. The repeated freezing and thawing of the soil causes it to slowly move downhill over time. This process is common in tundra landscapes and can lead to the formation of solifluction lobes or terracettes. Neither an avalanche, debris flow, nor a slump accurately describe the type of soil movement occurring in this picture.

What Is Happening to the Hillside in the Tundra Pictured