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nitrogen cycle the process through which nitrogen gas is changed into forms of nitorgen that plants can use nitrates and ammonia two forms of fixed nitrogen gas that plants can use bacteris in the soil and nodules on plant roots fix most of the nitrogen gas lightning fixes a small amount of nitrogen gas through animal waste how nitrogen is returned to the soil carbon dioxide-oxygen cycle the process by which carbon and oxygen cycle among plants, animals, and the environment. includes solar energy, photosynthesis, respiration, combustion and decay, fossil fuels respiration ocean organisms, and animals breathing in and using oxygen and giving off carbondioxide photosynthesis the process where plants use carbon dioxide and give off oxygen oceans, fossil fuels two places that carbon dioxide is stored