CH 7.3 Landscapes Shaped by the Wind
Download
1 / 21

CH 7.3 Landscapes Shaped by the Wind - PowerPoint PPT Presentation


  • 208 Views
  • Uploaded on
  • Presentation posted in: General

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha

Download Presentation

CH 7.3 Landscapes Shaped by the Wind

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


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


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


Blowout = shallow depressions resulting from deflation.


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


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


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: When more is LOESS.

China

Loess = windblown silt that blankets a landscape.

Loess Hills State Forest, Iowa


The problem of having loess.

Loess crumbles!

Memphis TN

Loess sinks!

New Madrid Seizmic Zone

Loess slides!


DUNES

= 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

Barchan

Namibia

Namibia

Mars

Santa Maria, CA

Namibia


Types of Sand Dunes

Longitudinal

Arabia

Padre Island, TX

North Dakota


Types of Sand Dunes

Transverse

Mojave, CA

Brazil

Namibia

Morocco


Types of Sand Dunes

Parabolic

Morocco

Namibia


Types of Sand Dunes

Barchanoid

Mars

Libia

Mars

New Mexico


Types of Sand Dunes

Star

Colorado

China

Algeria


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


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.


ad
  • Login