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http://www.sciencenews.org/view/access/id/44477
NOT ALWAYS UNDERWATER
Sonar scans of Lake Huron discern a sinuous line of boulders 350 meters long (running from A to B in top image) that resembles structures built by modern-day arctic hunters to guide caribou. The now-submerged lake bottom was at one point a hunting ground. Credit: IMAGE: O’Shea and Meadows; Jack Brink


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