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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 16.11 Glacial abrasion produces smooth rock surfaces that are cut by striations (scratches and grooves) oriented parallel to the direction of ice flow.

Can the direction of ice flow be determined with certainty from the evidence in this photograph?

To determine

Whether the direction of ice flow can be determined with certainty from the evidence in the accompanying photograph.

Explanation

The evidence shown in the accompanying photograph is striations. The process that creates striations is knows as glacial abrasion. Glacial abrasion produces smooth rock surfaces those are cut by striations those are oriented parallel to the direction of ice flow. The process of abrasion takes place when the rock fragments that are being carried and dragged along in the general flow of glaciers, scratch the bedrock. This generally tends to polish the rock surface when the bedrock is made up of highly resistant material and abrasion creates striations and grooves in the less-resistant bedrock...

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