Cycles

1. Life Materials and Nutrient Cycles  (site info) How life shares materials, why we need each other's "leftovers," water cycle, carbon cycle, nitrogen cycle, and sulfur cycle, including diagrams. http://cgee.hamline.edu/see/questions/dp_cycles/dp... 2. Biogeochemical Cycles  (site info) A brief look at the major nutrient cycles, including pictures. http://www.colorado.edu/GeolSci/courses/GEOL1070/c... 3. Water What Ifs - Water Quality and Nitrates and Phosphates  (site info) Shows the inter-relationship of these surface water parameters. http://www.ncsu.edu/sciencejunction/depot/experime... 4. Olympic Hands on the Land - Cycles  (site info) From the National Park Service, animated diagrams of the water, nitrogen, and carbon cycles. Includes explanations. http://www.nps.gov/olym/hand/nutrition1.htm 1-4 of 4.