A vast circle of ice has been found slowly rotating in North Dakotas Sheyenne river. Perfectly circular ice disks form on outer bends of rivers, where faster-running currents break chunks of surface ice away during cold weather. Retired engineer George Loegering captured the phenomenon on camera. Allen Schlag, National Weather Service hydrologist in Bismarck, North Dakota, told io9 that the larger the river, the bigger the ice circle likely to form on it.
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