How Do Freezing, Thawing, Wetting, and Drying Contribute to Soil

question 49

Multiple Choice

How do freezing, thawing, wetting, and drying contribute to soil creep?

• A) Gravity exerts a much stronger force when the soil is wet and thawed.
• B) The soil becomes much weaker when dry and frozen.
• C) The soil expands and contracts, lifting particles then lowering them a slight distance downslope.
• D) Eventually these cause the soil and regolith to suddenly slide down the slope.

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Definitions:

Sympathetic Control

The part of the autonomic nervous system that activates the body's "fight or flight" response under stress or threat.

Vertebral Arteries

Two major arteries of the neck that supply blood to the brain.

Thrombus

A blood clot that forms in a vessel and remains there, potentially leading to vascular obstruction.