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Black ice 02, Lake Silvaplana, Switzerland/Patterns of the Earth

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Black ice 02, Lake Silvaplana, Switzerland/Patterns of the Earth

During  very cold periods in wintertime when there is no wind and no snowfall , a thick, crystal-clear ice sheet can form on mountain lakes. The ice seems to be black due to the dark colour of the deep waters of the lake, which one can observe looking at the see-through layer of ice. Cracks and fields of air bubbles trapped in the ice appear as the white structures. (aerial view)