The tape rotates in the frozen river in China

floating on the Chinese river surface, can bear dozens of people standing up without breaking.

Hundreds of people flocked to see the rare circular tape in the frozen Liaoning river in northeastern China 's Liaoning province, Sun reported. The large cassette disc is constantly spinning like a record disc after separating from the ice in Khau Pho district on January 1. Many locals came to watch the tape and tried it above before it disappeared.

The cause of the phenomenon is that the temperature in the water increases and the water becomes denser.

Social network users are debating how the tape formed. One theory is that the ice mass eroded into a perfect circle when floating in the river. However, experts quickly rejected this hypothesis.

The phenomenon of ice discs often occurs in the Arctic, Scandinavia and northern Canada, but very rarely elsewhere. According to physicists at Liege University, Belgium, the cause of the phenomenon is that the temperature in the water increases and the water becomes denser. As the water around the edge of the ice begins to melt, it rotates to form a vertical vortex, similar to the process of making a hole. After that, the ice plate bumps into the surrounding ice, leading to a round shape. Tape discs are usually small in size, but can reach up to 17 meters in diameter.