Scientists say the "dead zone" in the Gulf of Mexico is the largest it's ever been.
The National Oceanic and Atmospheric Administration began mapping the area in 1985 and they say the area is larger than previously forecasted - now about the size of New Jersey.
A "dead zone" is referred to as an area with low oxygen levels where most marine life can't survive.
It can be caused when farming and wastewater treatment runs into the gulf creating an overgrowth of algae which then decomposes into the water.
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