The carbon cycle is one of the biogeochemical cycles. Carbon continually moves through these parts of the Earth system. In the atmosphere, carbon forms a greenhouse gas called carbon dioxide. Carbon is also an important component in bones, sea shells, and chemical sedimentary rocks like limestone. Living things, including plants and animals, are made of carbon and the depend of carbon for nutrition. It is able to combine with a large variety of other elements and as such it is found in some very different places within the Earth system.
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