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The cyclic exchange of nutrient material between organisms and non-living environment is called biogeochemical cycle ,'geo means earth: ''chemical' means chemical elements, thus biogeochemical cycle can be explained as cycle paths in which circulation of all essential elements takes place from the environment to the organisms and back to the environment some important biogeochemical cycles are as follows:
1. Water cycle or hydrological cycle
2. Oxygen cycle
3. Nitrogen cycle
4. Carbon cycle
5. Sulphur cycle
6. Phosphorus cycle
The first are gaseous cycles as they circulate between land and atmosphere where as the last one is sedimentary cycle it does not the atmosphere.
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