Agricultural fertilizer runoff from the Midwest travels through streams and rivers into the Gulf of Mexico, where it fuels massive algae blooms that deplete oxygen and create 'dead zones'—areas with no fish or marine life—demonstrating how human agricultural practices directly impact marine ecosystems through water flow.
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A Dead Zone FormsAdded:
A farmer in Iowa applying fertilizer in April is physically connected to the floor of the Gulf of Mexico in August.
The fertilizer washes into the streams and then sweeps down the river into the Gulf of Mexico, where it feeds a bloom of algae that smothers an area the size of New Jersey. There's no oxygen, no fish, just silence on the seafloor. We think of the continent as divided, farms here, oceans there. The water doesn't see this division. It just flows downhill, taking everything it picks up into the Gulf.
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