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Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536

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BuyFindarrow_forward

Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536
Textbook Problem

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FIGURE 12.27 Solifluction has formed these tongue-shaped masses of soil on a slope near Suslositna, Alaska.

How does solifluction differ from soil creep?

To determine

The way by which solifluction differ from soil creep.

Explanation

Solifluction is the flow of soil and it can be defined as the slow downslope movement of water saturated soil or regolith. It is most common in high latitude or high elevation tundra region that have a subsurface layer of permanently frozen ground known as permafrost. The permafrost layer is overlain by an active layer that freezes during winter and thaws during summer. During the summer thaw of active layer that has a thickness of centimeters to meters, the downward percolation of melted soil water will be prevented by the underlying permanently frozen ground. It makes the active layer into a heavy, water saturated soil mass that slowly moves downslope by the force of gravity until it refreezes even on a gentle incline. The evidences for solifluction are the irregular soil lobes that develops a hummocky terrain or mounds...

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