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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 12.11 Angular blocks of rock attributed to freeze–thaw weathering, like these on Armstrong Mountain in Washington, are common in mountainous areas that experience numerous freeze–thaw cycles.

Why are many rocks affected by freeze–thaw angular rather than rounded?

To determine

The reasons why many rocks are affected by the freeze-thaw angular rather than rounded.

Explanation

In a region that subject to many diurnal freeze-thaw cycles, water will freeze repeatedly in fractures and small cracks in the rocks. It results in the freeze-thaw weathering. It is also known as freeze-thaw weathering or ice wedging. The freezing of water expands up to about 9%, and this result in large pressure that is exerted on the walls and bottom of the crack...

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