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Earth's Core Might Hold Dozens of Oceans Worth of Hydrogen, Hinting at the Origins of the Planet's Vast Water Supply
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5+ hour, 56+ min ago (231+ words) More from Smithsonian magazine Mary Randolph - Freelance contributor Ocean water covers roughly 71 percent of Earth's surface and contains about 321 million cubic miles of water. Some 4.6 billion years ago, gas, rocks and dust clumped together to form Earth. In the baby…...