USGS CMG InfoBank Geology School: desert varnish

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Title	Comment	Keywords
Desert Varnish	16:42 - 18:16 (01:34) / 3.5 MB	"Richard Hazlett", desert, "desert varnish", "manganese oxide", clay, weathering, evaporation, precipitation, "acid rain", "chemical weathering", rainfall, microbe, "biological activity"
Conclusion	25:45 - 26:48 (01:03) / 1.3 MB	"James Sadd", desert, humans, life, dune, playa, salt, sand, "desert varnish", environment, landform, climate, lake, grassland, forest

Geology School Keywords

U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/keypage/desert_varnisht.html
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Page Last Modified: Tue Feb 5 05:12:55 PST 2013 (chd)