Which one of the following is a sedimentary ecological cycle?

Biogeochemical cycles are broadly classified into two types: gaseous cycles and sedimentary cycles.

Gaseous cycles have their main reservoir in the atmosphere or hydrosphere. Examples include the carbon, nitrogen, and oxygen cycles.

Sedimentary cycles have their main reservoir in the Earth's crust (lithosphere). Examples include the phosphorus, sulphur, and calcium cycles.

Therefore, the phosphorus cycle is a sedimentary ecological cycle.

Answer: Phosphorus