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» Biogeochemical Cycles 
A brief look at the major nutrient cycles, including pictures.
http://www.colorado.edu/GeolSci/courses/GEOL1070/chap04/chapter4.html
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» Olympic Hands on the Land - Cycles 
From the National Park Service, animated diagrams of the water, nitrogen, and carbon cycles. Includes explanations.
http://www.nps.gov/olym/hand/nutrition1.htm
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