re: Dead Zone in Gulf

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Im assuming that this area will not move until the river comes back up and moves the water, or is this always here and the river has nothing to do with it?

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Just to clarify, the dead zone corresponds with the high river. Agricultural runoff from the midwest loads the river with nutrients. The river dumps those into warm waters of the gulf and algal blooms form. Algae dies, sinks, decomposes, and removes oxygen from the water. Dead zone forms.