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A giant ice disk, almost perfectly circular, has formed in the Presumpscot River in Westbrook, Maine:
https://www.npr.org/2019/01/16/6858...ice-disk-takes-center-stage-mesmerizing-maine
As it slowly rotated, contact with one shore smoothed away the irregularities at its edge.
https://www.npr.org/2019/01/16/6858...ice-disk-takes-center-stage-mesmerizing-maine
As it slowly rotated, contact with one shore smoothed away the irregularities at its edge.