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Recent sonar surveys off the southeastern coast of the United States have detected dozens of broad furrows on the seafloor—trenches that were carved by icebergs during the last ice age, researchers suggest.
The channels, roughly parallel to the coast, are between 10 and 100 meters wide and typically less than 10 m deep, says Jenna C. Hill, an oceanographer at Coastal Carolina University in Conway, S.C. She and her team discovered the enigmatic features while conducting oceanographic surveys
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