nitrogen cycle

Pronunciation:			'nItrujun 'sIkul
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WordNet Dictionary
	Definition:		[n]  the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil
	See Also:		biological process, organic process
Biology Dictionary
	Definition:		The global cycle of moving various forms of nitrogen through the air, water, soil, plants, animals of the planet. See nitrogen fixation.