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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

What evidence indicates that the glaciers were once larger than today and extended farther down the valleys?

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To determine

The evidence indicating that the glaciers were once larger than today and extended farther down the valleys.

Explanation

The Chief Mountain, Montana, map area is located in Glacier National Park, which adjoins Canada’s Waterton Lakes National Park located across the international border. Most of the glaciated landscape in this region was produced during the Pleistocene. Prior to glaciation, this region was severely faulted and folded during the formation of the northern Rocky Mountains.

The photograph and topographic map clearly illustrate the rugged nature of the terrain in this map area. The horns, arêtes, steep mountain slopes, U-shaped valleys, lakes, and glaciers are landform characteristics of alpine glaciation. The steep valley slopes, sharp peaks, and flat valley bottom represent the work of glacial erosion...

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