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Glaciers
Common Test 13/2/14
15
Geography
7th Grade
02/07/2014

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Term
System?
Definition
A group of component parts and the linkages that join them together.
Term
Inputs?
Definition
Aspects that form inputs to a system.
Term
Outputs?
Definition
Outputs from the system.
Term
Freeze-thaw weathering?
Definition
A process of physical weathering by which rock disintergrates due to water in cracks repeatedly freezing and thawing.
Term
Erosion?
Definition
The wearing away and removal of material.
Term
Abrasion?
Definition
Erosion caused by the rubbing and scouring effect of matrial carried by rivers, glaciers, waves and the wind.
Term
Plucking?
Definition
A process of glacial erosion by which ice freezes onto weathered rocks and, as it moves, pulls pieces of rock with it.
Term
Glacier?
Definition
A slowly moving mass or river of ice formed by the accumilation and compaction of snow on mountains or near the poles.
Term
Pyrimidal peak?
Definition
A triangular-shaped mountain formed by three or more cirques cutting backwards, and with arêtes radiating from the central peak.
Term
Cirque (corrie)?
Definition
A deep, steep-sided, rounded or semi-circular hollow, often with a lake, found in glaciated highlands.
Term
Arête?
Definition
A narrow, knife-edged ridge formed by glacial erosion when two adjacent cirques erode towards each other.
Term
Avalanche?
Definition
A mass of snow, ice and rocks falling rapidly down a moutainside.
Term

From the top of the moutain side, what order do these come in?

abraison, rock lip, plucking, ice fall,freeze-thaw weathering.

Definition

1 - Freeze-thaw weathering

2 - plucking 

3 - abraison

4 - rock lip

5 - ice fall

Term
What are crevasses?
Definition
Large, deep cracks that run in the glaciers. Some may even cris cross over each other.
Term
Where do crevasses form?
Definition
Crevasses usually form in the top 50 meters (160 feet) of a glacier, where the ice is brittle.
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