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., Step 6, There is no oxygen in the water, so plants and animals begin to die., Step 7, Decomposers break down the dead organisms, and the water becomes a dead zone.

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