A 460-mile-long stretch of canyon was discovered underneath Greenland's ice sheet by NASA's Operation IceBridge. It runs from the center of the island to the fjord of the Petermann Glacier.
A 460-mile-long stretch of canyon was discovered underneath Greenland's ice sheet by NASA's Operation IceBridge. It runs from the center of the island to the fjord of the Petermann Glacier.
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