• There is a circulation of chemical nutrients like oxygen, carbon, nitrogen, phosphorus, calcium, and water, etc. through the physical and biological world; between the atmosphere, hydrosphere, lithosphere, and biosphere. These cycles are known as biogeochemical cycles.
  • These cycles are natural pathways of the circulation of essential elements of life.
  • For the survival of the major ecosystem, it is essential that all chemical elements make up the living cells must be recycled.
  • As an effect of these elements being recycled, in some cycles, the elements get accumulated for a long period of time and form reservoirs like ocean or lake.
  • Biogeochemical cycles are classed as in which the reservoirs are the air or the oceans via evaporation.

Important biogeochemical cycles include:

  • The Carbon cycle,
  • The Nitrogen cycle,
  • The Oxygen cycle,
  • The Phosphorus cycle,
  • The Sulfur cycle,
  • The Water cycle,
  • The Nutrient cycle and
  • The Rock cycle.
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