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Arctic expeditions find giant mud waves, glacier tracks

Scientists gathering evidence of ancient ice sheets uncovered a new mystery about what's happening on the Arctic sea floor today. Sonar images revealed that, in some places, ocean currents have driven the mud along the Arctic Ocean bottom into piles, with some "mud waves" nearly 100 feet across.

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Keywords: arctic, expeditions, giant, mud, waves, glacier, tracks, expedition, wave, track

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