Review - Exam 4 Chapter 13 - San Diego State University€¦ · Review - Exam 4 Chapter 13....
Transcript of Review - Exam 4 Chapter 13 - San Diego State University€¦ · Review - Exam 4 Chapter 13....
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Geology 100Notes on Planet Earth version 30
Review - Exam 4Chapter 13
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Glaciers and their significance
• >~75% of worlds freshwater supply• Covers about 10% of land surface• If melted, then sea level would rise 70 meters
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Two types
• Valley or alpine• Continental
– Ice Sheets– Ice caps
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Converting snow to ice
• Powder• Granular Snow/granules• Firn• Glacial Ice Decreasing
void space
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The budget of a glacier
• Zone of accumulation• Zone of wastage• Snowline• Negative versus positive budgets
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The movement of a glacierTangential component of gravity
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Till and moraines
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Landforms resulting from glaciation
• U-shaped valleys• Hanging valleys
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Landforms resulting from glaciation
• Cirques• Tarns• Paternoster lakes
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Landforms resulting from glaciation
• Arêtes• Horns
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Landforms resulting from continental glaciers
• Eskers• Kettles• Kames• Drumlins
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The Great Ice Age
• The Pleistocene epoch
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Milankovitch hypothesis
• Eccentricity• Obliquity• Precession