Chapter 7.2 deserts

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Chapter 7.2 deserts

  1. 1. Deserts<br />
  2. 2. What is a desert?<br />A desert is a landscape or region that receives an extremely low amount of precipitation, less than enough to support growth of most plants.<br />Deserts can also be described as areas where more water is lost by evaporation than falls as precipitation.<br />
  3. 3. Weathering<br />Mechanical Weathering is the breakdown of rocks and soils through direct contact with atmospheric conditions, such as heat, water, ice and pressure<br />
  4. 4. Ephemeral Streams<br />Ephemeral Streams also known as arroyos only carry water after it rains. <br />They may flow for a few hours or a few days.<br />Flash floods may follow<br />
  5. 5. Basin and Range<br />Found in Nevada, Western Utah, Southeastern CA, Arizona, and New Mexico.<br />200 small mountain ranges that rise between 900 and 1500 meters<br />
  6. 6. Alluvial Fan<br />A cone of debris located at the mouth of a canyon created by runoff from flash floods in deserts.<br />
  7. 7. Playa Lake<br />A desert lake that lasts a few weeks or days after abundant rainfall.<br />The lake bed that remains after the water evaporates is called a playa.<br />
  8. 8. Desertification<br />The expanding of deserts that occurs as a result of human and natural processes.<br />Drought causes vegetation to die and deserts expand.<br />

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