MIT scientists have discovered ancient rock samples from Greenland, Canada, and Hawaii exhibiting a rare potassium-40 deficit. This chemical signature suggests these rocks are remnants of "proto-Earth," predating the giant impact that formed the Moon. The findings challenge previous assumptions about the early Earth's complete remelting and offer a glimpse into the solar system's initial chemistry.from Science News: Fresh Discoveries, Research & Breakthroughs https://ift.tt/tJK9WbA
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