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22 Cards in this Set
- Front
- Back
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Deserts cover about ___% of earth's land surface. |
20% |
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3 types of deserts |
Latitudinal deserts Rain shadow deserts Costal deserts |
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Where are most of the world's found at? |
30°n and 30°s latitude |
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Important latitudinal deserts |
Sahara Sonoran |
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Playa |
A dry lake bed |
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Desert found in west TX. |
Chihuahuan desert |
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2 kind of wind erosion |
Suspension, saltation, and surface creep |
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2 kinds of wind erosion |
Deflation and abrasion |
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2 features produced by wind deflation |
Desert pavement and blowouts |
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3 types of wind transportation |
Suspension, saltation, and surface creep |
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Dust |
Clay and silt < .06 |
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Significance of dust storms |
Transport thousands of tons of sediments hundreds or even thousands of miles away. |
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Dune |
Mound or ridge of wind deposited sand. |
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Cross bedding |
Preserved in sandstone may indicate an ancient dune and the wind direction at the time. |
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Dunes |
Classified based on their shape |
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Types/shape of dunes depend on what? |
Wind speed and sand supply |
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Loess |
Wind deposited silt and clay, often of glacial origins. |
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Characteristics of a loess |
Yellow brownish, not layered |
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Where in the US do you find the most loess? |
Mississippi river valley |
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S. TX sand sheet |
Area of loess in S. TX |
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Another planet that has dunes |
Mars |
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Primary cause if desertification |
Overgrazing, removal of vegetation. |
