Geography - Ice On The Land

Ice on the land revision cards, for June 2012 exam.

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Formation Of A Corrie

A) Snow collects in hollows, B)  The snow compacts to the ice, C) Ice moves under gravity, lubricated by meltwater, D) Ice rotates to lip, E) Abrasion deepens corrie, F) Plucking steepens back and sides, G) Water can now fill the hollow.

Formation of a corrie (http://www.bbc.co.uk/scotland/learning/bitesize/standard/geography/images/glac_001a.gif)

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Formation of a Pyramidal Peak

A) Three or more corries form around a peak, (processes are the same as for corries), B) Where corrie sidewalls meet they form an arête (knife edge).Stages in the formation of a pyramidal peak  (http://www.bbc.co.uk/scotland/learning/bitesize/standard/geography/images/g94.gif)

Case Study:

Striding Edge

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Formation Of A U Shaped Valley

A) The glacier flows in an earlier 'V' shaped valley, B) The glacier abrades the sides and floor of the river valley, C) The valley is greatly deepened, widened and straightened, D) When the ice melts the valley is 'U' shaped, E) It has very steep sides and a fairly flat floor, F) Any later rivers are called 'misfit streams' because they are far too small to have cut the valley.

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What Is Terminal Moraine?

A) Where ice melts at snout (front end) of glacier, B) Marks point where the edge of the ice stayed steady, melting ice being replaced by new flows.

Glacier starting to melt forming terminal moraine (http://www.bbc.co.uk/scotland/learning/bitesize/standard/geography/images/g97.gif)

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Other Moraines

Lateral moraines are found deposited along the sides of the glacier.

Medial moraines are found at the junction between two glaciers.

Ground moraines are disorganised piles of rocks of various shapes, sizes and of differing rock types.

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Causes Of Avalanches

Major causes of avalanches are weather, snowfall, temperature, wind direction, snow pack conditions, slope angle, slope orientation, terrain, and vegetation

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Formation Of Avalanches

Avalanches are the result of snow being deposited in layers over the course of the winter.

The layers are sometimes dissimilar enough to create an area of slippage between them, which causes some part of the snowpack to slide and fall.

The vast majority of avalanches occur during snowstorms, and the likelihood of an avalanche is affected by the components of the Avalanche Triangle: weather, terrain, and snowpack.

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