ppt 7.1 earth
TRANSCRIPT
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Earth Science
7.1 Glaciers
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Ice Age
A period of time when much of Earth’s land is covered by glaciers
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Glaciers
A thick mass of ice origination on land from the compaction and recrystallization of from snow that slows evidence of past or present flow
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Snowline
Lowest elevation in a particular area that remains covered in snow all year
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Valley Glaciers
A glacier confined to a mountain valley, which in most instances had previously been a stream valley; also known as an alpine glacier
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Ice Sheet
Are enormous ice masses that flow in all directions from one or more centers and covered everything but the highest land
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Glacial trough
The once narrow V-shaped valley is changed into U-shaped
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Till
Sediment of different sizes deposited directly by glacier
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Stratified drift
Is sediment laid down by glacial meltwater
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Moraine
A ridge of unsorted sediment left by a glacier
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Key Concepts
What types of glaciers exist, and where is each type found?Valley GlaciersIce Sheets
How do glaciers move?Plastic FlowBasal Slip
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What distinguishes the various types of glacial drift? Weight of overlying ice and the associated
pressureWhat landscape features do glaciers
form?Glaciated ValleysCirquesAretes and Horns