Eutrophication

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Storyboard Description

a major problem with the use of fertilisers occurs when they're washed off the land by rainwater into rivers and lakes. The resulting increase of nitrate or phosphate in the water encourages algae growth, which forms a layer of algae ("algae bloom") over the water surface. This prevents sunlight reaching other water plants, which causes the water plants to die out. Bacteria break down the dead plants and use up the oxygen in the water through respiration. The oxygen level drops in the lake and leads to more death.

Storyboard Text

  • When too much fertilizer is used to nurture pant growth,
  • Fertilizer would be washed off the land by rainwater into rivers and lakes
  • Resulting increase of nitrate or phosphate in the water encourages algae growth, which forms a layer of algae ("algae bloom") over the water surface.
  • Algae bloom
  • This prevents sunlight reaching other water plants,
  • which causes the water plants to die out.
  • Bacteria break down the dead plants and use up the oxygen in the water through respiration. The oxygen level drops in the lake and leads to more death.
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