Fertilisers containing phosphates and nitrates are washed into the lake by rain - stage 1, The algae in the lake use the phosphates and nitrates in the fertiliser. - stage 2, The algae grow quickly. - stage 3, The algae become overcrowded and cannot get enough light for photosynthesis, so they die. - stage 4, Bacteria feed on the dead algae. - stage 5, As the numbers of bacteria grow, they use up all the oxygen in the water. The fish die. - stage 6,

CAX KS4 Eutrophication mix and match

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