Question

Where is the main store of phosphorus ?

Answer 1

The largest reservoir of phosphorus is in sedimentary rock. It is in these rocks where the phosphorus cycle begins. When it rains, phosphates are removed from the rocks (via weathering) and are distributed throughout both soils and water. Plants take up the phosphate ions from the soil.

Answer 2

Phosphorus is most commonly found in rock formations and ocean sediments as phosphate salts.