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Earth science 7.3
 

Earth science 7.3

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    Earth science 7.3 Earth science 7.3 Presentation Transcript

    • 7.3 Landscapes Shaped by Wind
    • Deflation
      • The lifting and removal of loose material by wind
    • Desert Pavement
      • A layer of coarse pebbles and gravel created when wind removed the finer material
    • Loess
      • Deposits of windblown silt, lacking visible layers, generally light yellow, and capable of maintaining a nearly vertical cliff.
    • dune
      • A hill or a ridge of wind-deposited sand
    • Key Concept
      • Wind erodes in the desert in two ways: deflation and abrasion
    • Key Concept
      • The wind can create landforms when it deposits its sediments, especially in deserts and along coasts. Both layers of loess and sand dunes are landscape features deposited by water.
    • Key Concept
      • Unlike deposits of loess, which form blanket-like layers over broad areas, winds commonly deposit sand in mounds or ridges called dunes.
    • Key Concept
      • What form sand dunes assume depends on the wind direction and speed, how much sand is available and the amount of vegetation.