Respiration- when living organisms break down food for energy they release Carbon dioxide as a waste product into the atmosphere., Photosynthesis- plants remove CO2 from the atmosphere, combustion- humans burn fossil fuels releasing carbon oxides into the atmosphere, carbon dioxide dissolves into lakes and oceans, sea creatures build shells from dissolved carbonates , carbonates from shells of sea creatures over millions of years are compacted into limestone, Ancient animals and plants eventually become fossil fuels such as coal, turf, oil, gas..., rain reacts with carbon dioxide in the atmosphere to form carbonic acid..

JC. The Carbon Cycle

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