Aboard the JOIDES Resolution research vessel, team members process samples of mantle rock recovered from a more than 4,100-foot-deep hole drilled into the seabed of the North Atlantic.(Lesley Anderson/US Antarctic Program & IODP JRSO)At an underwater mountain in the middle of the Atlantic Ocean, scientists have drilled nearly a mile beneath the ocean floor and pulled up an unprecedented scientific bounty - pieces of Earth's rocky mantle.
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