geonotes - Brown river= silt sized particles When salt...

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Brown river= silt sized particles When salt crystallizes it expands and fractures rock Weathering in arid climates- sand blasting and frost wedging (oxidation also but its much slower) Dry lands are concentrated in 2 regions: middle latitudes (deep interiors of continents) 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 Role of water in arid climates- practically all streambeds are dry most of the time Desert streams are said to be ephemeral: carry water only during periods of rainfall called wash and arroyo (western us), wadi (Arabia and n. Africa), donga (s. America), nullah (India) Desert rainfall- flash floods common b/c vegetation cover is sparse so runoff is unhindered Poorly integrated drainage systems and streams lack extensive tributaries Most of erosion in desert done by running water Basin and range: evolution of a desert landscape
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This note was uploaded on 05/25/2011 for the course GEO 111 taught by Professor Yates during the Fall '08 term at Grand Valley State.

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geonotes - Brown river= silt sized particles When salt...

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