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Lecture 18

Lecture 18 - Deserts and Winds

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Earth Sciences
Earth Sciences 1022A/B
Stephen R Hicock

Deserts and Winds y Geologic Processes o Weathering mainly mechanical with some oxidation o Water mainly ephemeral streams and flash floods o Oxidation of desert rock desert varnish o Ephemeral streamsmeans temporary to a lot of work while they are there y Transportation of Sediment by Wind o Bedload mainly by saltation bouncing skipping depends on grain collisions o Suspended load dust swept into the air and carried far away y Wind Erosion o Deflation wind removes fines leaving blowouts and coarse particles as desert pavements o Abrasion saltation sandblasts rock and stones creating ventifacts artifacts of the wind an
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