A dead zone is an area on the ocean floor where there isn’t enough oxygen to sustain marine life. They were first discovered in the 1970’s. The first dead zones were observed in areas of intensive economic development. These areas included:
in the East Coast’s Chesapeake Bay,
in the Scandinavia’s strait, also known as the Kattegat,
in the Black Sea, and
in the Northern Adriatic.
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