Mass Movements, Wind, and Glaciers

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Mass Movements, Wind, and Glaciers

• Chapter 8

Illustrations
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Wind Erosion

• Moving air can pick up and move sediment like
  water, but only extreme winds (hurricane or
  tornado) can transport large particles.

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Wind Erosion

• Suspension- small particles stay airborne for
  long distances.
• Saltation- bouncing transport along the ground.

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Wind Erosion

• Most areas that experience wind transport receive
  little rain and have little vegetation (ex.
  desert)

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Wind Erosion

• Deflation- Lowering of the land surface due to
  the loss of surface particles

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Wind Erosion

• Abrasion- particles of sand rub up against the
  surface of rocks or other materials
• Ventifacts- rocks shaped by abrasion

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Wind Disposition

• Wind disposition occurs when wind slows down and
  the suspended material drops out of the air.
• Dune- a pile of wind blown sand

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Types of dunes
Barchan
Transverse
Parabolic
Longitudinal
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Dune Migration
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Loess

• Fine grained wind blown deposits

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Glaciers
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Glaciers