Phosphorus Cycle
Movement of phosphorus from rocks through soils, organisms, and water, with no significant atmospheric component.
Real World
Morocco holds over 70% of the world's phosphate rock reserves; as global deposits deplete, scientists warn of 'peak phosphorus' threatening future food security within decades.
Exam Focus
Emphasise that phosphorus has no atmospheric phase — this distinguishes it from the carbon and nitrogen cycles and is a common exam question.
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