One day, when you're walking on the edge of the river and then saw a strange circle on the surface of the river, do not rush to conclude that a UFO had just landed in river. Maybe what you see is the Ice Circle newly formed.
Ice Circle or the circle of ice is a phenomenon that appears in the water that has a slow flow in a cold climate. The shape resembles a giant dish which consists of ice and rotates slowly on the surface of the water. The mystery is in fact already been mentioned in the 19th century. An illustration of the Ice Circle pictures ever published in the magazine Scientific American in 1895. London News also reported this phenomenon that occurred in Toronto in 1930.
Generally, this phenomenon appeared in Scandinavia and North America, but never once seen in the UK in January 2009.
Circle Ice generally appear on the curve of the river where water flow is accelerated to create a force called "Rotational shear", which then broke the ice blocks and play. In line with the rotation of the disc, he grind the ice around it so that it becomes smooth and forms a perfect circle. This phenomenon has been identified although the cause, but it remains a rare occurrence.
Here are some examples of beautiful ice circle:
Rivers in Michigan, USA.
Otten River in Devon, England. 3 meters in diameter
Frozen in the Russian River
A river in Sweden
Waldo, the United States.
Amasa, Michigan.
Connecticut, United States.
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