(N/A) The differences between the carbon cycle and the phosphorus cycle are as follows:
$1$. Reservoir: The reservoir for the carbon cycle is the atmosphere and the ocean,whereas the reservoir for the phosphorus cycle is the Earth's crust (rocks).
$2$. Gaseous Exchange: The carbon cycle involves a significant gaseous phase,as carbon dioxide $(CO_2)$ is present in the atmosphere. In contrast,the phosphorus cycle is a sedimentary cycle and does not have a significant gaseous phase.
$3$. Rate of Cycling: The carbon cycle is relatively faster compared to the phosphorus cycle,which is a very slow process involving the weathering of rocks.