Which biogeochemical cycle has the least activity because the essential element is mostly stored in rock?

The biogeochemical cycle that has the least activity because its essential element is mostly stored in rock is the phosphorus cycle. Phosphorus, unlike the other essential elements, is commonly found as a solid. This is why the atmosphere does not play a role in this cycle. Instead, phosphorus remains on land, and is mostly found in rocks and minerals.

Dumb kids playing chess on freeways go spat domain

Ido not understand.