USGS CMG InfoBank Geology School: semi-arid

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Title	Comment	Keywords
Development and Overgrazing	19:48 - 20:49 (01:01) / 1.9 MB	vegetation, humans, atmosphere, plant, tree, air, climate, rainfall, semi-arid, desert, desertification, agriculture, grazing
Sahel	21:42 - 23:02 (01:20) / 2.3 MB	desert, desertification, Africa, Sahel, Sahara, semi-arid, rainfall, grazing, drought, plant, soil, cattle, "dust storm", dune, Ethiopia, Sudan, human

Geology School Keywords

U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/keypage/semi-ariderts_.html
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Page Last Modified: Tue Feb 5 05:13:13 PST 2013 (chd)