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PHOSPHORUS CYCLE

PHOSPHORUS CYCLE. By Alexandra Coppola Francine Ryan . Reservoirs. Not found in troposphere because temperate and pressure are not suitable for gas form of P . Found as Phosphates PO 4 3-. Terrestrial Rocks. Ocean Bottom Sediments. Most abundantly found in . PATHWAYS. GEOCHEMICAL PHASE.

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PHOSPHORUS CYCLE

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  1. PHOSPHORUS CYCLE By Alexandra Coppola Francine Ryan

  2. Reservoirs Not found in troposphere because temperate and pressure are not suitable for gas form of P Found as Phosphates PO43- • Terrestrial Rocks • Ocean Bottom Sediments Most abundantly found in

  3. PATHWAYS

  4. GEOCHEMICALPHASE Weathering/soil erosion of rocks with P → Carried from streams and rivers to oceans → Settle out as Sediments→ Uplifting of seafloor by plate tectonics→ P exposed as terrestrial rock

  5. ECOSYSTEM PHASE Plants take up dissolved P→ Herbivores eat plants (carnivores eat herbivores) → Decomposers break down waste/dead organisms→Decomposers release phosphorus into soil→ Plants take up dissolved P

  6. Marine Ecosystem Phase P taken up by Plankton → Decomposition of organisms release P in water→ P rich shells become part of marine sediments→excretion form P rich resources→ dropping accumulate on islands (Guano) → guano deposits return sediments to sea

  7. Human Impact • Phosphates mined from deposits (see next slide) • Altering natural cycle • P used as fertilizer for crops • Excess P harmful to ecosystem • Death of cyanobacteria • Depletion of O₂ in H₂O • Animal waste can pollute streams/rivers • Too much P • P ends up in landfills/waterways from human diets

  8. Mining P

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