cycles

    Top: Kids_and_Teens: School_Time: Science: The_Earth: Cycles:

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• - How life shares materials, why we need each other's "leftovers," water cycle, carbon cycle, nitrogen cycle, and sulfur cycle, including diagrams.
  
• - Shows the inter-relationship of these surface water parameters.
  
• - A brief look at the major nutrient cycles, including pictures.
  
• - From the National Park Service, animated diagrams of the water, nitrogen, and carbon cycles. Includes explanations.