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Friday, 26 December 2008!
HandWritten on; 14:13
THE CARBON CYCLE-The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere pedosphere, geosphere, hydrosphere and atmosphere of the Earth.REMOVAL OF CARBON DIOXIDE FROM THE ENVIRONMENTGreen plants absorb carbon dioxide from the atmosphere during photosynthesis and use it to manufacture carbohydrates (glucose). -----------> Glucose is changed to other organic compounds (fats, amino acids, proteins) ---------------> 1. Carbon compounds become part of the bodies of the animals that feed on the green plants. 2. Carbon compounds may be preserved in fossil fuels (coals, natural gas, oil) 
the carbon cycle (picture from www.windows.ucar.edu)RELEASE OF CARBON DIOXIDE INTO THE ENVIRONMENTCarbon dioxide can be released into the environment through:RESPIRATION-When living organisms respire, carbon compounds (glucose) are broken down in their bodies and carbon dioxide is released into the environment.COMBUSION-When fossil fuels (coal, natural gas) are burnt or undergo combusion, carbon compounds preserved in the fossil fuels are broken down and carbon dioxide is released into environment.DECAY-When organisms die, their bodies decay or broken down into simple substances by decomposers.-Carbon dioxide is one of the simple substance released into the environment during the process.-Some of the simple substances are absorbed by the decomposers and become part of their body and carbon dioxide is released when they respire. 
the carbon cycle (picture from wikipedia)
THE IMPORTANCE OF THE CARBON CYCLE
-It ensures that there's a continuous supply of carbon dioxide for plants to carry out photosynthesis. Photosynthesis converts energy from the sun into chemical energy in food, which other organisms can use to stay alive.
-Enables energy to flow through the ecosystem. Carbon compounds carry the trapped solar energy from organisms to organisms in the food chains of an ecosystem.
