Oxygen discovery defies knowledge of the deep ocean
Until this discovery, it was believed that oxygen could not be produced without sunlight [Getty Images]/ Scientists have discovered “dark oxygen” being produced in the deep ocean, apparently by lumps of metal on the seafloor. About half the oxygen we breathe comes from the ocean. But, before this discovery, it was understood that it was made by marine plants photosynthesising - something that requires sunlight./ Here, at depths of 5km, where no sunlight can penetrate, the oxygen appears to be produced by naturally occurring metallic ...
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