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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. 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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  1. 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.

  2. Remember the Dust Bowl? South Dakota before the Dust Bowl South Dakota after the Dust Bowl

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

  4. 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

  5. Blowout = shallow depressions resulting from deflation.

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

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

  8. The wind rarely lifts sand more than a meter above the surface of the land. Can these be the result of wind erosion?

  9. Wind Deposits: When more is LOESS. China Loess = windblown silt that blankets a landscape. Loess Hills State Forest, Iowa

  10. The problem of having loess. Loess crumbles! Memphis TN Loess sinks! New Madrid Seizmic Zone Loess slides!

  11. DUNES = sand deposited by winds in mounds or ridges.

  12. 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

  13. Types of Sand Dunes Barchan Namibia Namibia Mars Santa Maria, CA Namibia

  14. Types of Sand Dunes Longitudinal Arabia Padre Island, TX North Dakota

  15. Types of Sand Dunes Transverse Mojave, CA Brazil Namibia Morocco

  16. Types of Sand Dunes Parabolic Morocco Namibia

  17. Types of Sand Dunes Barchanoid Mars Libia Mars New Mexico

  18. Types of Sand Dunes Star Colorado China Algeria

  19. 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

  20. 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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