similarities between nitrogen and sulfur cycles

Scan H G Machel's paper ,Bacteriological and chemical Sulfate reduction in diagenesis. I think its from about 2005 or so. It does a good job f looking at the"cycle" where elemental sulfur gos round and round from elemental to ionic to "ite" "ate" ultimately back to elemental sulfur. There are about 8 to 10 ways these two elements compare and contrast in their journeys. Bob Hazen has written a new book on the evolution of complex minerals on the planet and these are in it.
As far as the rest, you are on your own.
Homework is your responsibility.

One clue, both elements adjoin each other through another reactive element on the periodic table and both elements act as anions and cations. dont get too technical the answers are right in front of you