The carbon cycle is more prevalent in the atmosphere. The carbon cycle refers to the movement of carbon between living organisms, the atmosphere, and the Earth's crust. Carbon is exchanged between these different parts of the Earth's system through a series of natural processes, including photosynthesis, respiration, and decomposition. While carbon is found in all parts of the Earth's system, the largest reservoir of carbon is the atmosphere, where carbon dioxide (CO2) is present in the air. This is why the carbon cycle is more prevalent in the atmosphere. Carbon moves between the atmosphere and other parts of the Earth's system through processes such as the uptake of CO2 by plants during photosynthesis, the release of CO2 by respiration, and the transfer of carbon from the atmosphere to the oceans through dissolution.