CH 7.3 Landscapes Shaped by the Wind
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CH 7.3 Landscapes Shaped by the Wind. Humid areas can resist wind because the moisture holds the soil together. Desert soils are dry and have less vegetation to hold soil in place. Remember the Dust Bowl?. South Dakota before the Dust Bowl. South Dakota after the Dust Bowl.

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CH 7.3 Landscapes Shaped by the Wind

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Ch 7 3 landscapes shaped by the wind

CH 7.3 Landscapes Shaped by the Wind

Humid areas can resist wind because the moisture holds the soil together.

Desert soils are dry and have less vegetation to hold soil in place.


Ch 7 3 landscapes shaped by the wind

Remember the Dust Bowl?

South Dakota before the Dust Bowl

South Dakota after the Dust Bowl


Ch 7 3 landscapes shaped by the wind

Deflation = lifting and removal of loose particles such as clay and silt.


Ch 7 3 landscapes shaped by the wind

Saltation = jumping or skipping along the surface.

The wind moves coarse particles along the surface of a desert by saltation.

Watch this closeup of Saltation!

http://www.weru.ksu.edu/new_weru/multimedia/movies/dust003.mpg


Ch 7 3 landscapes shaped by the wind

Blowout = shallow depressions resulting from deflation.


Ch 7 3 landscapes shaped by the wind

Desert Pavement = surface layers of course pebbles and cobbles that are too heavy for the wind to move.


Ch 7 3 landscapes shaped by the wind

Wind Abrasion = when wind blown sand cuts and polishes exposed rock.


Ch 7 3 landscapes shaped by the wind

The wind rarely lifts sand more than a meter above the surface of the land.

Can these be the result of wind erosion?


Ch 7 3 landscapes shaped by the wind

Wind Deposits: When more is LOESS.

China

Loess = windblown silt that blankets a landscape.

Loess Hills State Forest, Iowa


Ch 7 3 landscapes shaped by the wind

The problem of having loess.

Loess crumbles!

Memphis TN

Loess sinks!

New Madrid Seizmic Zone

Loess slides!


Ch 7 3 landscapes shaped by the wind

DUNES

= sand deposited by winds in mounds or ridges.


Ch 7 3 landscapes shaped by the wind

Dunes occur in places where the wind encounters an obstruction.

This is the Wind Direction

The sand builds up then slides.

This is sand.

This is a rock.

http://www.fisica.ufc.br/hans/dunes.html


Ch 7 3 landscapes shaped by the wind

Types of Sand Dunes

Barchan

Namibia

Namibia

Mars

Santa Maria, CA

Namibia


Ch 7 3 landscapes shaped by the wind

Types of Sand Dunes

Longitudinal

Arabia

Padre Island, TX

North Dakota


Ch 7 3 landscapes shaped by the wind

Types of Sand Dunes

Transverse

Mojave, CA

Brazil

Namibia

Morocco


Ch 7 3 landscapes shaped by the wind

Types of Sand Dunes

Parabolic

Morocco

Namibia


Ch 7 3 landscapes shaped by the wind

Types of Sand Dunes

Barchanoid

Mars

Libia

Mars

New Mexico


Ch 7 3 landscapes shaped by the wind

Types of Sand Dunes

Star

Colorado

China

Algeria


Ch 7 3 landscapes shaped by the wind

Mountain Peak

400

460

450

440

370

430

420

350

410

1

2

3

4

5

6

7

8

9

390

380

V-shaped Valley

360


Ch 7 3 landscapes shaped by the wind

EXPLORATION LAB CH 7 Interpreting a Glacial Landscape

When you finish the lab, create study cards based on the information on pg 212 following the guidelines on your worksheet.


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