7.3 powerpoint 1

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7.3 powerpoint 1

  1. 1. Landscapes Shaped by Wind Chapter 7.3
  2. 2. Deflation and Abrasion Deflation is the lifting and removal of loose particles such as clay and silt Abrasion occurs when wind blown sand cuts and polishes exposed rock surfaces.
  3. 3. DESERT PAVEMENTCreated after abrasion removes all ofthe finer particles and leaves behind the larger coarser rock and pebbles. This pavement remains permanent unless vehicles, humans, or animals disturbed the surface.
  4. 4. WinddepositsLoess and SandDunes
  5. 5. LoessWindblown silt thatblankets alandscape.Dust storms havetransported thematerial overthousands of years.
  6. 6. Sand Dunes Winds commonly deposit blanket like layers of sand in mounds called dunes.
  7. 7. TYPES OF SAND DUNES Barchan Dunes Transverse Dunes Barchanoid Dunes Longitudinal Dunes Parabolic Dunes Star Dunes

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