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== The c cycle stand for the Carbon Cycle! Carbon is the fourth most abundant element in the universe, it is very necessary to life on earth. Carbon helps identify an organic or inorganic molecule. In the atmosphere, carbon is attached to some oxygen in a gas called carbon dioxide. Every organism on earth need CD (which comes from carbon dioxide) either for structure, energy, or both. Their is carbon in the atmosphere, biosphere, and hydrosphere. Plants use carbon dioxide and sunlight to make their own food and grow. Carbon dioxide is a greenhouse gas and traps heat in the atmosphere. without it and other greenhouse gases, earth would be frozen. The carbon Cycle must be a closed system, there is a fixed amount of carbon in the world and it must be somewhere. ==