Question

Assume you and a non-geologist friend are visiting Alaska's Hubbard Glacier shown in Figure 11.1. After studying the glacier for quite a long time, your friend asks, "Do these things really move?" How would you convince your companion that this glacier does indeed move using evidence that is clearly visible in this image?

Name: Problem 8, Chapter 11: Essentials of Geology
Uploaded: 2020-06-22T16:10:17-08:00
Duration: 4 min 39 s
Channel: Sarah Mccrumb
Description: Assume you and a non-geologist friend are visiting Alaska's Hubbard Glacier shown in Figure 11.1. After studying the glacier for quite a long time, your friend asks, "Do these things really move?" How would you convince your companion that this glacier does indeed move using evidence that is clearly visible in this image?

   Assume you and a non-geologist friend are visiting Alaska's Hubbard Glacier shown in Figure 11.1. After studying the glacier for quite a long time, your friend asks, "Do these things really move?" How would you convince your companion that this glacier does indeed move using evidence that is clearly visible in this image?

Essentials of Geology

Frederick K.… 11th Edition

Chapter 11, Problem 8

Instant Answer

Solved by Expert Sarah Mccrumb

06/22/2020

Step 1

First, I would point out the crevasses or cracks in the glacier. These crevasses form due to the movement and stress within the ice as the glacier flows downhill. The presence of crevasses is a clear indication that the glacier is moving. Show more…

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Assume you and a non-geologist friend are visiting Alaska's Hubbard Glacier shown in Figure 11.1. After studying the glacier for quite a long time, your friend asks, "Do these things really move?" How would you convince your companion that this glacier does indeed move using evidence that is clearly visible in this image?

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Key Concepts

Glacial Dynamics

Glaciers are not static; they are slowly flowing bodies of ice that move under their own weight. This movement occurs through internal deformation of the ice and sliding along the bed. The dynamic nature of glaciers is a core concept in understanding how they shape the landscape over time.

Crevasse Formation

Crevasses are deep cracks that develop in a glacier due to stresses from its movement. They form when different parts of the glacier move at varying speeds or directions, making their presence a clear indicator of glacial motion observable in the field.

Calving

Calving is the process where chunks of ice break off from the glacier’s edge, often seen at the terminus. This process is a direct consequence of the glacier's continuous movement and redistribution of mass, and serves as a visible sign that the glacier is actively flowing.

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