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Author Question: Why do continental glaciers flow? ... (Read 56 times)

APUS57

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on: Aug 7, 2018
Why do continental glaciers flow?

Question 2

Explain the difference between a terminal moraine and recessional moraine and how they are formed.


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cuttiesgirl16

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Reply #1 on: Aug 7, 2018
Answer to Question 1

Glaciers flow by internal plastic deformation when the weight of overlying ice, firn, and snow causes ice crystals at depth to arrange themselves in parallel layers that glide over each other. This deformation happens when a threshold pressure from the overlying mass is exceeded. Pressure is greater under thicker accumulations of ice, so continental glaciers flow radially outward from central areas of thicker ice to marginal areas of thinner ice.

Answer to Question 2

Terminal moraines and recessional moraines are types of end moraines, which are ridges of sediment deposited at the toe of a glacier. Terminal moraines mark the farthest advance of a glacier. Recessional moraines, however, are deposited during temporary pauses of a retreating glacier.


APUS57

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Reply 2 on: Aug 7, 2018
Thanks for the timely response, appreciate it

rleezy04

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Reply 3 on: Yesterday
Excellent

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