The world’s oldest water, which is locked deep within the Earth’s crust, just got even older. The liquid was discovered deep down in a mine in Canada in 2013 and is about 1.5 billion years old. But now, at the same site, University of Toronto scientists have found a deeper source of water that is at least 500 million years more ancient. The work was presented at the American Geophysical Union Fall Meeting in San Francisco.
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