In actuality, ice circles occur when moving water forces ice to slowly rotate. “What's happening here is shear—when on one side of the ice you have water that's moving faster than on the other side causing the ice to rotate,” Jackson says.
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AIce floats on a lake's surface until it is melted. Although it sometimes floats low in the water, it does not sink to the bottom, as some mistakenly believe. Water is heaviest at 39 degrees, lighter at higher or lower temperatures.