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Earth science 7.2
 

Earth science 7.2

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    Earth science 7.2 Earth science 7.2 Presentation Transcript

    • 7.2 Deserts
    • Alluvial fan
      • A fan- shaped deposit of sediment formed when a stream’s slope is abruptly reduced.
    • Playa lake
      • A flat area on the floor of an undrained desert basin that fills and becomes a lake after heavy rain.
    • Key Concept
      • By contrast, much of the weathered debris in deserts has resulted from mechanical weathering
    • Key Concept
      • Chemical weathering, however, is not completely absent in deserts. Over time spans, clays and thin soils do form.
    • Key Concept
      • In the desert, most streams are ephemeral- they only carry water after it rains.
    • Key Concept
      • Most desert streams dry up long before they ever reach the ocean. The streams are quickly depleted by evaporation and soil infiltration.
    • Key Concept
      • 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.