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Earth's Hadean Eon is a bit of a mystery to us, because geologic evidence from that time is scarce. Researchers at the Australian National University have used tiny zircon grains to get a better picture of early Earth. Credit: NASA

Early Earth Was Almost Entirely Underwater, With Just A Few Islands

12 May , 2017 by Evan Gough

Ancient grains of the mineral zircon help researchers paint a picture of Earth in the Hadean Eon, and that picture is mostly water.

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