Question

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

Name: Problem 9, Chapter 15: Essentials of Geology
Uploaded: 2020-06-22T16:10:17-08:00
Duration: 4 min 39 s
Channel: Sarah Mccrumb
Description: Assume that you and a nongeologist friend are visiting Alaska's Hubbard Glacier, shown here. After studying the glacier for quite a long time, your friend asks, "Do these things really move?" How would you convince your friend that this glacier does indeed move, using evidence that is clearly visible in this image?

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

Essentials of Geology

Frederick K.… 12th Edition

Chapter 15, Problem 9

Instant Answer

Solved by Expert Sarah Mccrumb

06/22/2020

Step 1

First, point out the crevasses or cracks in the glacier. These crevasses are formed due to the movement and stress within the ice as the glacier flows downhill. If the glacier was not moving, we wouldn't see these cracks. Show more…

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

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Key Concepts

Crevasse Formation

Crevasses are deep cracks or fractures that develop in a glacier as a result of differential movement or stress within the ice. Their presence is a clear indicator of motion because they form when faster-moving ice forces adjacent, slower-moving ice to pull apart. The alignment and distribution of crevasses across the ice surface serve as natural records of the glacier’s flow and deformation over time.

Glacial Motion

Glaciers are not static; they move due to gravity acting on the mass of accumulated snow and ice. This movement, known as glacial flow, is a fundamental aspect of glacier dynamics. Observing features that indicate a change in the ice's structure over time, such as patterns that suggest stretching or bending, can provide visible evidence of motion.

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