BIOGEOCHEMICAL CYCLES

• 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.