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  • 1. fertiliser is used on the land
  • 2. rain washes away the fertiliser from farms and gets absorbed into the soil
  • 3. sewage and waste from urban areas also get washed into water sources
  • Nitrogen
  • 4. excess nitrogen and phosphorous end up in water bodies via rivers and underground rivers. plants start to grow rapidly due to the abundance of nutrients
  • Phosphorous
  • Nitrogen
  • Phosphorous
  • 5. algae blooms also rapidly grow on the water's surface, absorbing the excess nutrients from fertiliser runoff. it blocks sunlight from reaching the bottom of the water body
  • 6. plants cannot absorb enough sunlight for photosynthesis. oxygen supply diminishes as plants, fish, and decomposers that feed on dead fish all use up the little oxygen left. more organisms die.
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