week 13 deserts

week 13 deserts - Deserts Wind aeolian processes-Deserts...

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Unformatted text preview: Deserts, Wind, aeolian processes, -Deserts cover about 1/3 of the Earth’s land surface Common fallacies about deserts:- Lifeless- hot- endless expanses of sand- wind is dominant erosion process Extremely arid = more that 12 consecutive months without precip Arid lands < 250 mm/yr Semi-arid lands (steppes) = 250-500 mm Weathering in Dry environments-well-developed soils in humid regions reflect chemical weathering- deserts have thing soils, mechanical weathering dominates- lack of moisture=low chemical weathering-Some chemical weathering creates thin oxidized soils-Desert streams are usually ephemeral- rains mostly don’t soak in - flash floods- lack of veg= great erosion- wash or arroyo- Wadi or Donga or Nullah-Desert streams lack extensive systems of tributaries- non-ephemeral desert streams usually start outside- lack of permanent streams creates internal drainage- alluvial fans- Bajada- playa lakes- playa...
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week 13 deserts - Deserts Wind aeolian processes-Deserts...

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