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Unformatted text preview: Deserts What are Deserts? Deserts are regions with dry climates (10-in of rain or less) Where do they form? Desert Climates Desert Water balance Moisture deFcits Evaporation exceeds Precipitation Deserts versus steppes Arid versus semi-arid climates Desert-grassland Mid- and low-latitude Deserts Low latitude Deserts Between 20-30 degrees latitude Most extensive Largest in the Sahara Mid-Latitude Deserts Continental interiors (Gobi, Chihuahuan) Rain shadow deserts (Great Basin) How do they change? Deserts expand during droughts Deserts Geology Dustfall increases too, in adjacent semi-arid regions Weathering in Deserts Low moisture slows chemical weathering Temperature changes enhance physical weathering Salt Crystallization Wind abrasion Armoring of surfaces Wind in Deserts DeFation Blowouts Abrasion Dust Production Transport Saltation - sand Suspension - clay and silt How does water occur?...
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This note was uploaded on 08/18/2008 for the course GEOL 1610 taught by Professor Byers during the Fall '08 term at North Texas.
- Fall '08