Question

how is carbon cycle a chemical cycle

Answer 1

since carbon is a chemical element as also the carbon reaction includes various chemical reaction includin carbon as a reactant in some cases and as a product in some cases...hence it is a chemical cycle..:)

Answer 2

Most of the chemicals that make up living tissue contain carbon. When organisms die the carbon is recycled so that it can be used by future generations. The model that describes the processes involved is called the carbon cycle.