Carbon
(11)
Nitrogen
(11)
Phosphorus
(2)
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Water
(14)
Biogeochemical Cycles
A brief look at the major nutrient cycles, including pictures.
Water What Ifs - Water Quality and Nitrates and Phosphates
Shows the inter-relationship of these surface water parameters.
Olympic Hands on the Land - Cycles
From the National Park Service, animated diagrams of the water, nitrogen, and carbon cycles. Includes explanations.
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