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Deserts

Deserts. BY STURDIPANTS. Geology in Arid Climates. Unlike the smoothed hills and rocks of humid regions, arid climates contain angular rocks and steep canyon walls This is because mechanical weathering dominates in deserts. Water in Arid Regions.

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Deserts

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  1. Deserts BY STURDIPANTS

  2. Geology in Arid Climates • Unlike the smoothed hills and rocks of humid regions, arid climates contain angular rocks and steep canyon walls • This is because mechanical weathering dominates in deserts

  3. Water in Arid Regions • There is rain in deserts, so chemical weathering does occur, although only in bursts • Desert streams typically only flow after rains. We call these ephemeral streams

  4. Basin and Range Systems • Unlike most other streams, desert streams don’t always reach oceans • These systems in which water temporarily exists in bowls (basins) between mountains (ranges), are called Basin and Range systems

  5. Playa Lakes • Deserts lose water quickly due to both evaporation and infiltration • However, after heavy rainfall, temporary lakes called playa lakes may exist • Although lakes and streams are short-lived, water is still the #1 erosive force, before wind

  6. Wind Erosion • Strong winds can pick up small particles, transport them, and deposit them elsewhere • Deflation – lifting of loose, fine-grained particles • After deflation occurs, only large sediment is left behind, called – desert pavement

  7. Wind Deposition • Exactly the same as water, when wind loses velocity, it no longer has the ability to transport sediment • This especially happens as the wind reaches some obstruction • This deposition of wind blown sediment creates formations like sand dunes

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