Water cycle-the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land
Nitrogen cycle-the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition
Carbon cycle- the series of processes by which carbon compounds are interconverted in the environment
Phosphorus cycle- The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.
