Question

what is difference between nitrogen cycle and oxygen cycle?

Answer 1

nitrogen cycle is the cycle of nitrogen and oxygen cycle is the cycle of oxygen

Answer 2

Differences:  They are different in the manner that they cycle.  Nitrogen gas is quite abundant (78% of the air around us is nitrogen).  It cannot be used by plants or animals in its gaseous form though. In order for it to be useful, it has to undergo nitrification (Nitrogen gas being changed into a usable form).  This is carried out by bacteria that live in nodules on the roots of some plants (like beans).  Once the nitrogen is used by the plant and makes its way to an animal, it can be released through decomposition or urination.  Once it is back in the soil, another type of bacteria cause denitrification, which turns it back into nitrogen gas. 
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