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7.2 Deserts
Alluvial fan <ul><li>A fan- shaped deposit of sediment formed when a stream’s slope is abruptly reduced. </li></ul>
Playa lake <ul><li>A flat area on the floor of an undrained desert basin that fills and becomes a lake after heavy rain. <...
Key Concept <ul><li>By contrast, much of the weathered debris in deserts has resulted from mechanical weathering </li></ul>
Key Concept <ul><li>Chemical weathering, however, is not completely absent in deserts. Over time spans, clays and thin soi...
Key Concept  <ul><li>In the desert, most streams are ephemeral- they only carry water after it rains. </li></ul>
Key Concept <ul><li>Most desert streams dry up long before they ever reach the ocean. The streams are quickly depleted by ...
Key Concept <ul><li>Most desert erosion results from running water. Although wind erosion is more significant in deserts t...
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Earth science 7.2

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Transcript of "Earth science 7.2"

  1. 1. 7.2 Deserts
  2. 2. Alluvial fan <ul><li>A fan- shaped deposit of sediment formed when a stream’s slope is abruptly reduced. </li></ul>
  3. 3. Playa lake <ul><li>A flat area on the floor of an undrained desert basin that fills and becomes a lake after heavy rain. </li></ul>
  4. 4. Key Concept <ul><li>By contrast, much of the weathered debris in deserts has resulted from mechanical weathering </li></ul>
  5. 5. Key Concept <ul><li>Chemical weathering, however, is not completely absent in deserts. Over time spans, clays and thin soils do form. </li></ul>
  6. 6. Key Concept <ul><li>In the desert, most streams are ephemeral- they only carry water after it rains. </li></ul>
  7. 7. Key Concept <ul><li>Most desert streams dry up long before they ever reach the ocean. The streams are quickly depleted by evaporation and soil infiltration. </li></ul>
  8. 8. Key Concept <ul><li>Most desert erosion results from running water. Although wind erosion is more significant in deserts than elsewhere, water does most of the erosional work in deserts. </li></ul>
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