carbon monoxide -  A toxic gas that forms during incomplete combustion of a fossil fuel, complete - the type of combustion that produce carbon dioxide and water when a fossil fuel is burned, combustion - The scientific name for burning a.k.a the reaction that occurs between a fuel and oxygen, incomplete - The type of combustion that occurs with a limited supply of oxygen, carbon dioxide - This gas forms during the complete combustion of a hydrocarbon, fossil fuels - Coal, oil, natural gas and peat are examples of this type of fuel,

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