Why it is important to study cycles in couples.

In studying biogeochemical cycles in couples, it is easier to understand how the cycles interact with each other, and provides a better understanding of how they are interdependent.   For example, the element carbon passes through the earth's atmosphere, biosphere, lithosphere, and hydrosphere, playing key roles in different cycles.  Elements are often "recycled", by having the output of one cycle become the input of another.  Coupling the nitrogen and oxygen cycles could lead to a better understanding of their relationship,  and may help determine the best use of nitrogen fertilizers.  Coupling the biogeochemicalcycles helps us to understand the true consequences of our actions as humans, because of the deeper understanding it gives us regarding the interdependency of the earth's natural cycles.