Ice bubbles trapped in north China river

White bubbles are formed in rivers and lakes when bacteria decompose organic matters in the water and expel methane gas. The gas, insoluble in water, becomes bubbles trapped in ice on their way to the frozen surface. 

The view was captured on camera in Chuoer River in northern China's Inner Mongolia Autonomous Region. Watch the video to find out.

(Cover images via VCG, video provided by China Meteorological Administration)

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