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geo directory

Some of these questions must be answered by consulting your textbook which correlates with the video series.  Consult: "Physical Geology -Earth Revealed" by Carlson, Plummer and McGeary; published by McGraw Hill, New York City, NY


  22. Wind, Dust and Deserts 
  Land in arid climates is shaped in particular ways. This program shows how deserts are defined by infrequent precipitation and how desertification relates to proximity to the equator, proximity to mountains, and ultimately plate tectonics. Images of landscapes illustrate how wind creates features such as dunes, playas, blow-outs, and even oases.

Episode 22:

Where are most deserts located?


What is a desert?


Describe how proximity to the equator affects the formation of deserts.


Describe the rain shadow effect and the formation of deserts.


What other factors influence the location and formation of deserts?


Describe the affect of precipitation on the desert.


What are alluvial fans?


Why do most deserts have interior drainage patterns?


How is sand transported by wind?


What are playas?


Describe the formation of desert pavement.


Describe the formation of desert varnish.


How can the removal of vegetation lead to desertification?


How did ranching and farming practices contribute to the Dust Bowl of the 1930s?


How is modern technology contributing to the desertification of sub-Sahara Africa?


Discuss efforts to reduce desertification on a global scale.


Why do you think that desert lands are so fragile?