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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

  1. (a) images
  2. (b) images

FIGURE 16.12 (a) Formation of a roche moutonnée (sheep-back rock), by glacial abrasion on the up-ice of a bedrock hill and plucking on the down-ice side. (b) An example of a roche moutonnée in Yosemite National Park, California.

Why would crevasses form in ice flowing above this feature?

To determine

The reason why crevasses form in ice flowing above Roche Moutonnée.

Explanation

Crevasses are ice cracks that form in the upper surface of glaciers. The top surface of glaciers is a brittle zone. Here, the glaciers are not compacted ice crystals in parallel layers, unlike deeper compacted layers.

The brittle zone ice cracks and fractures as it is carried along with the deeper layers of ice that flows in a plastic manner...

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