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• Nitrogen cycle - Wikipedia, the free encyclopedia

  The nitrogen cycle is the biogeochemical cycle that describes the transformations of nitrogen and nitrogen-containing compounds in nature. It is a gaseous cycle.

• Nitrogen Cycle

  Diagram, facts, nitrogen fixation methods, and what fixes nitrogen.

• The Nitrogen Cycle

  An explanation of the different forms of nitrogen on earth, nitrogen fixation, decay, and nitrification.