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Dead zones

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Gulf of Mexico – The dead zone at the mouth of the Mississippi River, largely caused by annual fertilizer and farm chemical runoff from the Mississippi and the Atchafalaya rivers, is said to cover 7,000 square miles or more, or the size of New Jersey, depending on rainfall or floods. This runoff fuels algae blooms, dropping oxygen levels needed to sustain life. It is considered the largest dead zone in the US. (Source: NOAA, Scientific American)

PHOTO: Newscom/File

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