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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 16.16 (a) Preglacial landscape of upland hollows and mountain stream valleys. (b) Alpine glaciers originate in upland hollows and advance down preexisting stream valleys as the ice age intensifies. (c) Geomorphic work accomplished by the glaciers is evident in the postglacial landscape.

How do the stream valley cross sections change from preglacial to postglacial time?

To determine

The way in which the stream valley cross sections change from the preglacial to postglacial time.

Explanation

As alpine glaciers enlarge and flow out of their cirque basins, they travel downslope in the pre-existing stream valley before the ice is accumulated. Unlike streams that meander, the glaciers flow straight ahead by causing them to straighten the preexisting stream valleys.

In general, steep mountain stream valleys have V-shaped cross-section. Glaciers modify V-shaped stream valleys into U-shaped stream valleys...

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