Answer:
Carbon cycle.
Explanation:
Biogeochemical cycle are the cycles present in the atmosphere that regulates the composition and amount of the elements in the atmosphere. Two main types of cycle are sedimentary cycle and gaseous cycle.
The carbon cycle consists of the reservoir of carbon in the form of carbonates and the fossil fuels. These components are exchanged in the atmosphere with the help of carbon cycle. The carbon cycles regulates and maintains the component of carbon in nature.
Thus, the answer is carbon cycle.
