Download - CH 7.3 Landscapes Shaped by the Wind
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CH 7.3 Landscapes Shaped by the WindHumid areas can resist wind because the moisture holds the soil together.
Desert soils are dry and have less vegetation to hold soil in place.
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South Dakota after the Dust Bowl
Remember the Dust Bowl?
South Dakota before the Dust Bowl
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Deflation = lifting and removal of loose particles such as clay and silt.
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Saltation = jumping or skipping along the surface.
The wind moves coarse particles along the surface of a desert by saltation.
http://www.weru.ksu.edu/new_weru/multimedia/movies/dust003.mpgWatch this closeup of Saltation!
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Blowout = shallow depressions resulting from deflation.
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Desert Pavement = surface layers of course pebbles and cobbles that are too heavy for the wind to move.
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Wind Abrasion = when wind blown sand cuts and polishes exposed rock.
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Can these be the result of wind erosion?
The wind rarely lifts sand more than a meter above the surface of the land.
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Wind Deposits: When more is LOESS.
China
Loess = windblown silt that blankets a landscape.
Loess Hills State Forest, Iowa
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Loess slides!
Loess crumbles!
The problem of having loess.
Loess sinks!New Madrid Seizmic Zone
Memphis TN
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DUNES= sand deposited by winds in mounds or ridges.
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Dunes occur in places where the wind encounters an obstruction.
This is a rock.
This is the Wind Direction
This is sand.
The sand builds up then slides.
http://www.fisica.ufc.br/hans/dunes.html
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Barchan
NamibiaSanta Maria, CANamibia
Types of Sand Dunes
NamibiaMars
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Types of Sand Dunes Longitudinal
Padre Island, TXNorth DakotaArabia
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Types of Sand Dunes TransverseMojave, CABrazilNamibiaMorocco
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Types of Sand Dunes ParabolicMoroccoNamibia
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Types of Sand Dunes BarchanoidMars
LibiaNew Mexico
Mars
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Types of Sand Dunes StarColoradoChinaAlgeria
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V-shaped Valley
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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.