Discussion
Which of the following is known as the sedimentary cycle because its reservoir is sedimentary rock ?
Answer: D
The sedimentary cycle is the phosphorus cycle.
Biogeochemical cycles are classed as gaseous, with the atmosphere or ocean as reservoir, or sedimentary, with the earth's crust as reservoir. Phosphorus has no significant gaseous phase. Its reservoir is phosphate rock and sediments, from which it is released slowly by weathering, used by organisms, and returned to ocean sediments.
The carbon and nitrogen cycles are gaseous cycles with large atmospheric pools of CO2 and N2, and the hydrologic cycle cycles water through the atmosphere and oceans. Sulphur is often described as intermediate, with both gaseous and sedimentary phases.
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