The phosphorus cycle describes how phosphorus moves through the biosphere and lithosphere. Phosphorus is essential for life and is found in cell membranes, ATP, and bones. It cycles through geological and biological processes, with the long term cycle involving the weathering of phosphorus-containing rocks and the short term cycle moving phosphorus through ecosystems via photosynthesis, decomposition, and the food chain.

1. Topic : Phosphorus Cycle

2. The Phosphorus Cycle
 Phosphorus:
 cell membranes
 ATP - Adenosine tri PHOSPHATE
 bones - calcium phosphate
 Two methods of P recycling:
 geological (abiotic)
 living organisms (biotic)

3. Long Term Cycle
 Most common form: a part of rocks
 Properties:
 soluble - dissolve in water
 Phosphates dissolve in water—erosion
carries them from land to streams and rivers
and then finally to the oceans
 Oceanssediments may be thrust upward
and once again form land through geological
activity

4. Long Term Cycle

5. Short Term Cycle
 Phosphates in water also enter the food chain
through photosynthetic organisms
 Decomposition of dead organismssoluble
phosphates are absorbed by plants and used
during photosynthesis
 Plants are eaten by animals

6. Short Term Cycle

7. Phosphorous Cycle