Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Development and Overgrazing

Skip navigational links
Loading
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 19:48 - 20:49 (01:01)
Source: Annenberg/CPB Resources - Earth Revealed - 22. Wind, Dust and Deserts
Keywords: vegetation, humans, atmosphere, plant, tree, air, climate, rainfall, semi-arid, desert, desertification, agriculture, grazing

Our transcription: If great amounts of vegetation are destroyed as land is developed or overgrazed, the bare earth may be exposed, reflecting heat back into the atmosphere.
If there are no trees or plants to store heat and release moisture, the air gets warmer and dryer, and there's less chance of rain.
With no tree or plant cover for anchorage, the topsoil can erode rapidly discouraging new plants from taking root.
If the region lies in a semi-arid climate or near the margin of a desert, this destruction of soil and vegetation may convert it into new desert.
This change may be permanent for all practical purposes, for once desertification starts it takes a costly effort to stop.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  


Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/20.01.23.html
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:27:42 PDT 2013  (chd)