Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Climate and Time


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Comment: 17:04 - 17:49 (00:45)

Source: Annenberg/CPB Resources - Earth Revealed - 15. Weathering and Soils

Keywords: weathering, soil, climate, "geologic time", rock, "Midwestern United States", "fertile soil", tropic

Our transcription: Climate and time also play important roles in the evolution of soil.

As time passes and the soil matures, it progressively loses the signature of the rock it was formed from and takes on characteristics determined by the climate.

Fertile soil doesn't come into existence quickly.

It took about 15,000 years for this layer of transported soil less than a meter thick to develop in the American Midwest.

Soils in the tropics can develop faster, in a few thousand years.

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U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/14.01.18.html Page Contact: InfoBank staff Page Last Modified: Fri Sep 18 02:37:18 PDT 2009 (wcs)