Lecture29 - Thought of Day At this time of the semester, it...

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At this time of the semester, it is easy to focus on the immediacy of examinations and lose sight of the ultimate goal of this class. Hopefully, you have gained some appreciation for how science progresses, learned how the Earth operates, and gained more experience in learning new material through better study habits. Thought of Day
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Chapter 19 Deserts
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Distribution and causes of dry lands ¾ Dry regions cover 30 percent of Earth’s land surface ¾ Two climatic types are commonly recognized Desert or arid Steppe or semiarid Figure 19.2
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Dry lands are concentrated in two regions 1) Subtropics Low-latitude deserts in vicinities of the Tropics of Cancer and Capricorn Areas of high pressure and sinking air that is compressed and warmed (results in a higher relative humidity and thus less precipitation) Distribution and causes of dry lands Figure 19.3
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2) Middle-latitudes Located in the deep interiors of continents High mountains in the path of the prevailing winds produce a rainshadow desert Distribution and causes of dry lands Figure 19.4
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http://www.opbba.com/op/areaphotos/big/forks/rainforest.jpg http://www.mountainguides.com/photos/simo/rainierb.jpg http://www.tawbaware.com/DSCN0803Resized.jpg
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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 Desert varnish is a common “alteration” product in the desert Desert varnish of rock fragments
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This note was uploaded on 04/18/2011 for the course EAS 101 taught by Professor Kirschner during the Spring '11 term at Saint Louis.

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Lecture29 - Thought of Day At this time of the semester, it...

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