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

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



Saltation clay and silt. = 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



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



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

Can these be the result of wind erosion?


Wind Deposits: surface of the land. When more is LOESS.

China

Loess = windblown silt that blankets a landscape.

Loess Hills State Forest, Iowa


The problem of having loess. surface of the land.

Loess crumbles!

Memphis TN

Loess sinks!

New Madrid Seizmic Zone

Loess slides!


DUNES surface of the land.

= sand deposited by winds in mounds or ridges.


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


Types of Sand Dunes obstruction.

Barchan

Namibia

Namibia

Mars

Santa Maria, CA

Namibia


Types of Sand Dunes obstruction.

Longitudinal

Arabia

Padre Island, TX

North Dakota


Types of Sand Dunes obstruction.

Transverse

Mojave, CA

Brazil

Namibia

Morocco


Types of Sand Dunes obstruction.

Parabolic

Morocco

Namibia


Types of Sand Dunes obstruction.

Barchanoid

Mars

Libia

Mars

New Mexico


Types of Sand Dunes obstruction.

Star

Colorado

China

Algeria


Mountain Peak obstruction.

400

460

450

440

370

430

420

350

410

1

2

3

4

5

6

7

8

9

390

380

V-shaped Valley

360


EXPLORATION LAB obstruction.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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