Step 1, Farmers put fertilisers on their fields, Step 2, Fertilisers are washed into lakes and rivers by the rain (leaching/run off), Step 3, There is rapid growth of algae at the surface (algal bloom), Step 4, Algae stop sunlight reaching other plants in the water., Step 5, Plants underneath the algae cannot do photosynthesis, they die., Step 6, Decomposers break down the dead organisms, they multiply and respire using up all the oxygen., Step 7, Fish die due to suffocation.

Eutrophication

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