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carbon dioxide (CO2)

Pronunciation:   kar-bon dI-oks-Id
   
Definition : A colorless, odorless, noncombustible gas with the formula CO2 that is present in the atmosphere.
   
Facts: It is formed by the combustion of carbon and carbon compounds (such as fossil fuels and biomass), by respiration, which is a slow combustion in animals and plants, and by the gradual oxidation of organic matter in the soil.