eutrophication

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  • Eutrophication occurs naturally over centuries as lakes age and are filled in with sediments. However, human activities have accelerated the rate and extent of eutrophication through discharges such as nitrogen and phosphorus
  • fertilisers are added
  • when precipitation occurs, the fertiliser is washed into the ground by the rain
  • the fertiliser and other chemicals get transported to rivers and lakes, leading to water pollution
  • this increases algal growth and forms a buildup on the surface of the lake, preventing sunlight from reaching the submerged plants. The plants are unable to photosynthesise and they die
  • x
  • the bacteria from the dead plants use up the oxygen. This causes the other organisms to suffocate and die.
  • x
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