Some of the Earth’s oldest rocks may have formed from the high temperatures of meteorite impacts, a new study reports.
Tagged With crust
Four and a half billion years ago, some dust from a cloud orbiting around a star coalesced into a rocky planet. But unlike most of the dusty balls in our solar system, this one was special -- it was just the right distance away from the star that one day after the surface had cooled, water could exist as a liquid, rather than a solid or gas. The planet's surface eventually fractured into plates that shifted around, becoming continents. All that shifting has rubbed away the details of that ancient Earth. Was the era as hellish as its name "Hadean" implies, or was Earth always a water-rich orb with moving plates?