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by Charlie Moor
Mailonline
Video filmed in Omsk Oblast captured an amazing and rare phenomenon
Ice disk formed at a bend in the 100ft-wide river which was still and calm
Phenomenon occurs when some but not all of river water is frozen solid
Accelerating water creates a force called 'rotational shear' which twists ice
This bizarre footage shows a 50ft ice disk slowly spinning around in a freezing Russian river.
The video, filmed in Omsk Oblast, captured an amazing and rare phenomenon where disks of frozen water can build up in rivers and rotate.
The disk formed at a bend in the 100ft-wide river which was otherwise totally still and calm.
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