Subject: carbon cyclePrepared by Aram I. Abdul-Rahman

2011-1-27

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The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. It is one of the most important cycles of the earth and allows for carbon to be recycled and reused throughout the biosphere and all of its organisms.

The carbon cycle was initially discovered by Joseph Priestley and Antoine Lavoisier

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All living organisms contain carbon CO2 is found in all living organisms Plants use carbon dioxide and water to

form simple sugars (photosynthesis)

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Carbon is needed for life Carbon dioxide is a greenhouse gas Carbon is necessary for life, but carbon

dioxide can be harmful

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The atmosphere Approximately 750 petagrams Biosphere 540- 610 gigatons Hydrosphere 38,00-40,00 metric tons

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Plants take in carbon dioxide and convert it to sugar which can be stored until used for energy.

This process is called photosynthesis.

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CO2 + H2O + sunlight yields O2 + C6H12O6

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Plants release carbon dioxide as a waste product when they convert their stored sugar to chemical energy.

This process is called respiration.

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C6H12O6 + O2 yields CO2 + H2O + energy

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Animals eat carbon contained in animal and plant tissues and release carbon dioxide as a waste product.

This process is respiration.

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Decomposers release the carbon from dead plant and animal tissues back into the atmosphere.

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Over millions of years fossil fuels may form from the buried remains of plants and animals.

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This carbon reenters the atmosphere during combustion.

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Dissolved carbon dioxide in sea water becomes deposited as calcium carbonate shells.

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Over millions of years, these shells form sedimentary rock.

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Ocean deposits are the biggest sink of carbon on the planet.

The Rock Cycle ultimately releases carbon stored in sedimentary rock.

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