Glaciers

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  • Created by: mollblake
  • Created on: 31-03-14 19:33
What is a glacier?
A slow-moving river of ice.
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Where are they formed?
In upland areas where snow accumulates to a depth of over 15m.
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What happens to the snow?
It is compressed to form ice known as firn.
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What does gravity do to the glacier?
It causes the glacier to flow downhill.
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What is the end of a glacier known as?
A snout.
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What are crevasses?
Deep cracks in a glacier.
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What is a glacial surge?
A rapid advance of a glacier.
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What is a glacial surge caused by?
A build-up of melt water which reduces friction.
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What is freeze-thaw weathering?
The water in a crack freezes and expands, putting pressure on the rock, causing it to fracture and break apart.
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What is plucking?
The rocks become stuck to the ice and are then pulled away from the valley sides and floor as the glacier moves downhill.
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What is abrasion?
Eroded material is transported by the glacier and scrapes along the valley sides and floor, wearing it away.
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What is a corrie?
A large bowl-shaped hollow found in upland areas where glaciers are formed.
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What is an arete?
A narrow ridge with steep sides between two corries.
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What is a pyramidal peak?
A mountain with a sharp, pointed summit.
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What is a glacial trough valley?
A U-shaped valley that has been eroded as a glacier moves downhill.
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What is a ribbon lake?
A long, narrow lake found in the bottom of glacial troughs.
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What is a truncated spur?
A spur that has had its end cut off by a glacier flowing down a valley that was previously formed by a river.
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Other cards in this set

Card 2

Front

Where are they formed?

Back

In upland areas where snow accumulates to a depth of over 15m.

Card 3

Front

What happens to the snow?

Back

Preview of the front of card 3

Card 4

Front

What does gravity do to the glacier?

Back

Preview of the front of card 4

Card 5

Front

What is the end of a glacier known as?

Back

Preview of the front of card 5
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