1. What is an icefall? a. It is an area that is exensively fractured due to a st

Question

1. What is an icefall?

a. It is an area that is exensively fractured due to a steep increase in gradient of the glacier.

b. Ice fall is the general term used to describe glacial ice moving down any slope in a very rapid, but over a short time span. It is usually more than a hundred feet per day.

c.In a warming climate, warm summer days or abundant rainfalls can cause a sudden decrease in the thickness of the glacier. This sudden drop in the glacier is called an ice fall

.d. It is an area at the terminus of a glacier where large blocks of ice fall off into water.

Explanation / Answer

Ice fall is a region on a glacier which is characterized by deep crevasses (cracks) formed from rapid deformation of the ice in a short time. Usually glacier ice moves very slowly, so it deforms with ductility, but in case of an Ice fall, the ice was mobilized in such a short time that Ice did not have enough time to deform with ductility, instead just broke leaving multiple cracks all over the region. Hence option A is correct.

For a rough idea, think of an Ice fall as how it looks like, after a fresh avalanche.

Good luck. :)

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