13 Cards in this Set
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Glacier
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Thick mass of ice that originates on land from the accumulation, compaction and recrystallization of snow
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Valley (Alpine)
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snow accumulates at high altitude, flow as a stream of ice down the valley
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Continental
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Lager scale, 2 major sheets on Earth over Greenland and Antarctica, ice flows out in all directions from one or more snow accumulation centers
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Ice Caps
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Glaciers that cover uplands and plateaus
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Exit Glaciers
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Valley glaciers or ice caps that flow into the oceans
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How glacial ice forms
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1. Starts as snow
2. Air infiltrates snow, evaporating edges causing snowflakes to become smaller
3. More snow accumulates, forcing air out. Snow recrystalizes into dense mass
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Zone of accumulation
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area where snow accumulates and turns into ice
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Firnline
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above this line snow will survuve until next winter
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Ablation
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amount of ice and snow lost from a glacier
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Glacial Erosion
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Plucking- lifting rocks off of the valley floor and transporting them with the ice
Abrasion- rocks that are within the ice scrape along the ground smoothing surface below
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Alpine Glacial features
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Cirques (bowl), , U-shaped valleys, Hanging Valleys, Moraines, Fjords, Crevasses
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Continental Glacial Features
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Drumlins, Eskers, Kettles
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Causes of Ice Ages
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Plate tectonics, Variations in earth's orbit, Variations in earth's atmosphere, Changes in the albedo, Changes in ocean currents
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Chapter 10