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Photosynthesis
CO2 is converted into sugars
Cellular Respiration
Sugars are converted back into Co2
Exchange
CO2 in the atmosphere and CO2 dissolved in water are constantly exchanged
Sedimentation
Calcium carbonate precipitates out of the water sediments .
Extraction
Human extraction of fossil fuels brungs carbon to earth’s surface where it can combusted
Burial
some carbon can be buried.
Combustions
Fossil fuels and plant matter are converted not CO2.
Note 
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