Geology notes october 20 for exam 2

Geology notes october 20 for exam 2 - glacier in a lateral...

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Geology Alpine glaciers develop when ice and snow build up on mountain peaks and then flow down valleys -They flow from the accumulation zone, where snow and ice accumulate, down slope to the ablation zone, where the ice melts Alpine glaciers sculpt mountains by plucking out and grinding away rocks as they flow along -This glacial erosion makes U-shaped hanging valleys and bowl-shaped cirques. Horns are sharp peaks formed by the intersection of arêtes -aretes are steep ridges that separate cirques -tarns are lakes that form in the bottom of cirques. The rock material collected by an alpine glacier is deposited along side of the
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Unformatted text preview: glacier in a lateral moraine or at the end of the glacier in an end moraine. Continental glaciers cover Antarctica and Greenland During the Pleistocene the climate was cooler and much more of the Earths water was tied up in continental glaciers. Continental glaciers have occurred several times in the Earths history There is evidence that the entire earth was frozen at times in the Precambrian to make a snowball earth. The earths surface temperature is controlled primarily by the amount of solar energy that it receives.-Direct sunlight deposits the most energy so equatorial regions are warmest...
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This note was uploaded on 08/09/2011 for the course GEOS 1004 taught by Professor Aksinha during the Fall '08 term at Virginia Tech.

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