Chapter 6- - Chapter 6 Glaciers Deserts and Winds Glaciers Thick ice mass originating on land from the accumulation compaction and

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Chapter 6- Glaciers, Deserts, and Winds Glaciers Thick ice mass originating on land from the accumulation, compaction, and recrystallization of snow The first known glaciation event occurred 2 billion years ago and the last episode about 250 million years ago. Causes of Glaciation: 1. Climatic changes associated with landmasses changing position 2. Variations in the Earth’s orbit Movement : Snow and ice accumulates in the zone of accumulation (higher altitude) above what is called the snowline . Below the snowline, snow from the previous winter completely melts, as does the ice during summer conditions. The glacier then retreats because of an imbalance between accumulation and wastage . When there is a balance between the two, the glacier halts its retreat and becomes stationary. There are two types of Glaciaton: 1. Alpine - Confined to a smaller area 2. Continental - large ice sheets covering a large amount of land Alpine 1. Smaller area 2. V-shaped valleys become U-shaped as glacier erodes the mountain 3. Numerous features formed from plucking and abrasion of rock as the glacier retreats. Plucking
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This note was uploaded on 04/19/2008 for the course PHYSCI 700 taught by Professor Knubley during the Spring '08 term at University of Arkansas – Fort Smith.

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Chapter 6- - Chapter 6 Glaciers Deserts and Winds Glaciers Thick ice mass originating on land from the accumulation compaction and

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