Wind Erosion 2/17/12

12-2 pgs. 304-308

IN: What are some ways that waves shape the shoreline?

Terms:Saltation deflation abrasion dune

loess Objectives:• Explain why areas with fine materials are

more vulnerable to wind erosion.• Describe how wind moves sand and finer

materials.• Describe the effects of wind erosion.

Saltation – the movement of sand-sized particles by a skipping and bouncing action in the direction the wind is blowing.

Deflation – the lifting and removal of fine sediment by wind. Leaving behind rock fragments.

Abrasion – the grinding and wearing down of rock surfaces by other rock or sand particles.

All the material carried by the wind is eventually deposited downwind.

The faster the wind blows, the more materialand the heavier the particles it can carry.

Dunes – mounds of wind-deposited sand.

Dunes tend to move in the direction of strong prevailing winds.

Loess – thick deposits of windblown, fine-grained sediment.

Very fine sediment, most came from last ice-age and are blown large distances, makes great soil for crops

OUT: What areas have the greatest amount of wind erosion and deposition? Why?