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  The carbon cycle is composed of two important processes: photosynthesis and respiration. 
1.    Plants absorb carbon-dioxide form the atmosphere and combine it with water to produce carbohydrates and give out oxygen – process is called photosynthesis. 
2.    When animals consume plants (as food), they oxidize the food at cellular level and breathe out carbon dioxide – process is called respiration.
3.    Also, during night, most plants perform respiration instead of photosynthesis and give out carbon dioxide.
4.    Carbon dioxide is also highly soluble in water and is absorbed in large quantities by the water bodies. It can also be stored in rocks in the form of carbonates.
5.   After death of a plant or animal, decomposition takes place and carbon dioxide gets released into atmosphere.
6.   Carbon can also be buried inside the earth and converted to coal or natural gas. Natural gas and Coal are fuels and on combustion they release carbon dioxide back into the atmosphere.