Write a short note on global carbon cycle with the help of diagram.

 Some carbon however enters a long term cycle referred to as ‘‘Global Carbon cycle’’ in which carbon accumulates in the form of organic matter in the peaty layers of bogs and moorlands or as insoluble carbonates (for example the insoluble calcium carbonate ((CaCO3) of various sea shells) in bottom sediments of aquatic systems. This sedimentary carbon eventually turns into sedimentary rocks such as lime stone and dolomite. In deep oceans such carbon can remain buried for millions of years till geological movement may lift these rocks above sea level. These rocks may be exposed to erosion, releasing their carbon dioxide, carbonates and bicarbonates into streams and rivers. Hard water has usually flowed through lime stone at some point, picking up carbonates which they accumulate as ‘fur’ in kettles when the water is boiled. Fossil fuels such as coal, petroleum and natural gas are also part of the carbon cycle which may release their carbon compounds after several years. These fossil fuels are organic compounds that were buried before they could be decomposed and were subsequently transformed by time and geological processes into solid or liquid hydrocarbon fuels. When fossil fuels are burned the carbon stored in them is released back into the atmosphere as CO2(2.10 b). The current global cycle shows an increased concentration of CO2 in the atmosphere. The resulting climate change phenomenon is at the forefront of the environmental problems faced by the world at present.

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