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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 16.6 Most glacier movement is by internal plastic deformation of ice at depth, but glaciers with meltwater at their base also move by basal slippage.

Why does surface ice move farthest even though internal plastic deformation is only occurring at depth in the ice?

To determine

The reason why the surface ice moves farthest even though internal plastic deformation is

only occurring at depth in the ice.

Explanation

Internal plastic deformation causes continental glaciers to flow radially outward in all the directions from the central thicker areas of ice (higher pressure) to the thinner marginal areas of ice (lower pressure). In alpine glacier, the internal plastic deformation causes the glaciers to flow from upslope to downslope with respect to the force of gravity. The internal plastic deformation (plastic flow) occurs in the deeper layers of the ice due to the weight of the overlying glaciers exerting compressional pressure on the lower layers making it to move...

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