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Cycles

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Biogeochemical Cycles
[ Teens/Mature Teens ] - A brief look at the major nutrient cycles, including pictures.
http://www.colorado.edu/GeolSci/courses/GEOL1070/chap04/chapter4.html
Olympic Hands on the Land - Cycles
[ Teens ] - From the National Park Service, animated diagrams of the water, nitrogen, and carbon cycles. Includes explanations.
http://www.nps.gov/olym/hand/nutrition1.htm
Water What Ifs - Water Quality and Nitrates and Phosphates
[ Teens/Mature Teens ] - Shows the inter-relationship of these surface water parameters.
http://www.ncsu.edu/sciencejunction/depot/experiments/water/lessons/np/
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