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  • Fertilisers are washed into rivers or lakes by rainwater
  • Results in an increase of nitrate or phosphate in the water which forms a layer of algae over the water surface.
  • Algae bloom
  • This layer of algae prevents sunlight from reaching other water plants, which causes the water plants to die out
  • Algae bloom
  • Bacteria break down the dead plants and use up the oxygen in the water through respiration.
  • o2
  • Bacteria
  • o2
  • Bacteria
  • Algae bloom
  • o2
  • Bacteria
  • Oxygen is crucial for the survival of aquatic plants and animals.
  • o2
  • o2
  • o2
  • o2
  • The decrease in oxygen levels in the water leads to more death.
  • X
  • X
  • X
  • X
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