Mass Movements, Wind, Mass Movements, Wind, and Glaciersand Glaciers

Chapter 8Chapter 8

Illustrations

8.1

8.1

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8.1

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8.1

Wind ErosionWind Erosion

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

Wind ErosionWind Erosion

• Suspension- small particles stay airborne for long distances.

• Saltation- bouncing transport along the ground.

Wind ErosionWind Erosion

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

Wind ErosionWind Erosion

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

Wind ErosionWind Erosion

• Abrasion- particles of sand rub up against the surface of rocks or other materials

• Ventifacts- rocks shaped by abrasion

Wind DispositionWind Disposition

• Wind disposition occurs when wind slows down and the suspended material drops out of the air.

• Dune- a pile of wind blown sand

Types of dunesTypes of dunes

Barchan

Transverse

Parabolic

Longitudinal

Dune MigrationDune Migration

LoessLoess

• Fine grained wind blown deposits

GlaciersGlaciers

GlaciersGlaciers