The large marine dead zone that forms in the Gulf of Mexico each summer is caused by

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The large marine dead zone in the Gulf of Mexico is caused by algae blooms. These algae blooms create a large amount of organic matter that sinks to the bottom of the ocean and is decomposed by bacteria, using up all of the oxygen in the process. This lack of oxygen creates a dead zone where many species of marine life cannot survive.

The Large Marine Dead Zone That Forms in the Gulf