When are these elements "bio?"
When living organisms are involved in the process, that step is biological. For example, a tree releasing oxygen is considered biological.
When are they "geo"?
When it takes place underground in the dirt, it's geological.
When are they chemicals in air and water?
When the chemicals are released into the air or water by the exhalation of marine animals and land animals, or smoke and fog.
Why is it important that these are cycles?
Cycles ensure that the process will continue to happen. The cycle spreads through the lands, air, and organisms, so it's evenly spread.References:
http://en.wikipedia.org/wiki/Biogeochemical_cycle
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