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  • Fertilisers are used on agriculture
  • When it rains, the fertilisers are absorbed by the soil and ends up in rivers and lakes
  • The increased amount of nitrate and phosphate in the water encourages algae and plant growth
  • algae bloom!!!
  • The lack of sunlight prevents them from photosynthesizing and leads to them dying
  • The algae bloom prevents sunlight from passing through to reach the other aquatic plants.
  • Bacteria breaks down the dead plants and use up the oxygen in the water through respiration
  • This creates a 'dead zone' lacking sufficient oxygen to support most organisms
  • ... and this process is known as "eutrophication"
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