Geology notes november 5 for exam 3

Geology notes november 5 for exam 3 - -Hadley cell-ferrel...

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Geology All kinds of optimistic projections about limiting CO2 emissions have been made but I wouldn’t bet on any of them Deserts are areas that receive an average annual precipitation of less than 10 inches per year -lack water -deserts cover about one fifth of the Earth’s land surface. Water is one of the key ingredients of life and we will do whatever we need in order to get it -We pay more for a gallon of bottled water that we do for a gallon of gasoline. Annual rainfall is generally high in the eastern US but relatively low in the west. -Much of the western US is arid to semiarid. Why? Why do deserts form? -the equator is warmer than the poles because it is closer to the sun -Also, solar incidence at the equator is nearly at right angles to the surface -global air circulation is driven by warm moist air rising near the equator and cold dry air sinking near the poles Global air circulation consists of three main convection cells
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Unformatted text preview: -Hadley cell-ferrel cell-polar cell Jet streams flow along the boundaries of these cells Deserts tend to occur in between 30* and 35* north and south of the equator because of sinking dry air of the Hadley and Ferrel cells. Global circulation is deflected by earth turning under the flowing air (Coriolis Effect)-Flow to the north is diverted to make eastward prevailing winds-Flow to the south is diverted to make westward prevailing winds When prevailing winds flow up mountain slopes moisture is removed from the air-When that air flows down the other side of the mountains it becomes warm and dry-Deserts develop in the rain shadow of mountains. Blacksburg lies in a rain shadow but the mountains are not high enough to create a desert The lower basin of the Colorado River is an arid region where water conflict is likely The Colorado River is fed by melting snows from the Rocky Mountains...
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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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Geology notes november 5 for exam 3 - -Hadley cell-ferrel...

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