Step 1, Farmers put fertilizers on their fields, Step 2, Fertilizers are washed into lakes and rivers, Step 3, There is rapid growth of algae at the surface, Step 4, Algae stop sunlight reaching other plants in the water., Step 5, Plants underneath the algae cannot do photosynthesis, so they can't make oxygen for other living things and they die, Step 6, Bacteria multiply and break down the dead organisms, they use up the oxygen for respiration, Step 7, Fish die.

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