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Table of Contents Title: 8.3 Glaciers Page: 80 Date: 3/4/2013
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Objective Students will be able to explain how glaciers form. Students will be able to compare and contrast the conditions that produce valley glaciers and continental glaciers.
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Word of the Day Glacier: A large moving mass of ice.
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8.3 Glaciers Glaciers: Form at poles and at high elevations (mountain tops) where snow falls faster than it melts: zones of accumulation. – Weight of overlying snow turns bottom snow to ice.
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8.3 Glaciers 2 Kinds of Glaciers: 1.Valley 2.Continental
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Valley Glacier
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Continental Glacier
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8.3 Glaciers Valley Glaciers: Form in mountainous areas. – When ice gets to be 20 m thick glacier will flow as a rigid solid due to its weight. – Crevasse: a deep crack in the surface of the glacier. – Speed of glacier depends on the slope of valley floor, temperature and thickness of ice and shape of valley walls – Glaciers will turn V-shaped stream valleys in to U-shaped glacial valleys.
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Glacier Crevasse
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8.3 Glaciers Continental Glaciers: Glaciers that cover broad contintent sized areas. – Cold Climates where snow accumulates over many years. – Thickest at the center. Weight forces rest of glacier to flatten in all directions. – Confined to Greenland and Antarctica.
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8.3 Glaciers Glacial Movement: Valley glaciers and continental glaciers move outward when snow gathers at the zone of accumulation.
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Glaciers Flow
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