Ch19_As Presented

Ch19_As Presented - Chapter 19 Deserts and Winds...

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Chapter 19 Deserts and Winds
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Distribution and causes of dry lands Dry regions cover 30 percent of Earth’s land surface Two climatic types are commonly recognized Desert or arid Steppe or semiarid
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Desert and steppe regions of the world Figure 19.2
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Distribution and causes of dry lands Dry lands are concentrated in two regions Subtropics Low-latitude deserts In the vicinities of the Tropics of Cancer and Capricorn Areas of high pressure and sinking air that is compressed and warmed
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Subtropical high pressure belts and dry regions Figure 19.3
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Distribution and causes of dry lands Dry lands are concentrated in two regions Middle-latitudes Located in the deep interiors of continents High mountains in the path of the prevailing winds produce a rainshadow desert
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Rainshadow desert Figure 19.4
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Table 19.A
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Geologic processes in arid climates Weathering Not as effective as in humid regions Mechanical weathering produces unaltered rock and mineral fragments Some chemical weathering in deserts does produce Clay Thin soils Oxidized minerals
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Geologic processes in arid climates Role of water in arid climates Practically all streambeds are dry most of
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This note was uploaded on 07/17/2008 for the course GS 121 taught by Professor Leavell during the Fall '07 term at Ohio State.

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Ch19_As Presented - Chapter 19 Deserts and Winds...

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