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                  Phosphorus Cycle
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      - Component of DNA, RNA, ATP, proteins and enzymes
        - Cycles in a sedimentary cylce
        - A good example of how a mineral element becomes part of an
        - The source of Phosphorus (P) is rock.
        - It is released into the cylce through erosion or mining.
        - It is soluble in H2O as phosphate (PO4)
        - It is taken up by plant roots, then travels through food chains.
        - It is returned to sediment

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