Some massive disks of ice were seen spinning in Chinese and Russia rivers recently.
And this winter phenomenon is very impressive and unexpected. Just look by yourself!
Genhe County, Inner Mongolia, China – November 18
Bystritsa river, Kirov region, Russia – November 17
Aristovo river, Ryazan region, Russia – November 21
How a giant spinning ice disk forms
Ice disks are a happy accident of nature and are almost always perfectly round.
The first theory about their formation is that river water creates a whirlpool around a chunk of ice. The water slowly erodes the ice until its edges are perfectly smooth and circular.
The second theory says that river currents likely help such disks form initially but temperature changes are what keep them spinning. “Warm water is less dense than cooler water, so as ice melts and sinks, it creates a vortex under the disk that causes it to rotate. The warmer the water, the faster the disk spins.“
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