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Mark Behn planting a seismometer

Recording ice movement

This summer, geologist Mark Behn drilled 8 feet down into Greenland's ice sheet and left seismometers at the bottom of the holes to record ice cracking and movement. Researchers will retrieve the instruments next year to see what happened on the ice (how it has melted and shifted) in previous months, in an effort to learn more about melting on the ice sheet (the world's second largest, after Antarctica). (Photo by Chris Linder, Woods Hole Oceanographic Institution)


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