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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
  3. (c) images

FIGURE 16.21 (a) Prominent lateral moraines on the Kenai Peninsula of Alaska. (b) Where two valley glaciers flow together, their adjoining lateral moraines merge into a medial moraine, a dark ribbon of till forming a stripe near the middle of the truck glacier. (c) An end moraine of a glacier in Pakistan.

What can we learn from studying moraines?

To determine

The information obtained from studying moraines.

Explanation

Moraine is an accretion of till by glaciers. This debris ranges from powdery silt to large boulders. The distinct varieties of moraines are lateral moraine, medial moraine, end or terminal moraine, recessional moraine, and ground moraine.

Lateral moraines are deposited on the sides of the valley glaciers. Medial moraines are formed by coalescence of two lateral moraines between two valley glaciers. The sediments those are carried forward by the glacier in the “conveyor belt” fashion are deposited at the glacier’s toe in a random pile of all grain sizes that forms a curved depositional ridge called an end moraine. Terminal moraine is an end moraine formed at the maximum limit of glacier advance. Recessional moraine is an end moraine formed when a glacier temporarily halts while retreating...

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