The nitrogen cycle showing how the element nitrogen is cycled through the environment.

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Photo credit: © Photiconix / Alamy / Afripics
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Keywords: ammonia, ammonium, animal, atmosphere, bacteria, biology, biosphere, chemistry, cycle, ecosystem, education, educational, environment, eutrophication, fertilizer, fixation, gas, leaching, legume, leguminous, lightning, manure, natural, nitrate, nitrification, nitrite, nitrogen, plant, proteins, science, scientific