Dead zones occur in coastal areas around the nation and in the Great Lakes — no part of the country or the world is immune. The second largest dead zone in the world is located in the U.S., in the northern Gulf of Mexico.
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While it is just possible for man to reach the summit of Everest without supplementary oxygen, this can only be done at the expense of extreme hyperventilation and respiratory alkalosis, and even then the arterial PO2 is less than 30 Torr.
Lincoln was part of the first Australian expedition to climb Mount Everest in 1984, which successfully forged a new route. He reached the summit of the mountain on his second attempt in 2006, miraculously surviving the night at 8,700 m (28,543 ft) on descent, after his family was told he had died.