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The Rock Cycle: USGS 


Introduction to Soils: USGS Natural Resources Conservation Service 


Introduction to rock types: Utah Geological Survey 


Weather and Soil:  USDA 


Lichens of North America: Online details of the Brodo, Sharnoff, and Sharnoff book


Weathering: Tulane University 


Example of Weathering Rates: University of Georgia 




For More Information

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