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A "Skypunch" in Switzerland. This rare phenomenon occurs when ice crystals form above the clouds and fall downward.

from Telegraph.co.uk

Pictures of the day: 21 February 2011

ice phenomenon | China's Liaodong Bay. Ice discs or ice pans are a natural phenomenon ...

9 Amazing Natural Phenomenons

“In March, due to a natural phenomenon, Siberia’s Lake Baikal is particularly amazing to photograph. The temperature, wind and sun cause the ice crust to crack and form beautiful turquoise blocks or ice hummocks on the lake’s surface.” Photograph by Alexei Trofimov

This is a rare meteorological phenomenon called a skypunch. When people see these, they think it's the end of the world. Ice crystals form above the high-altitude cirro-cumulo-stratus clouds, then fall downward, punching a hole in the cloud cover

from BuzzFeed

30 Natural Phenomena You Won’t Believe Actually Exist

Tidal bores on the Amazon in Brazil and the Severn in England: a tidal phenomenon in which the leading edge of the incoming tide forms a wave of water that travels up a river against the flow. | 30 Natural Phenomena You Won’t Believe Actually Exist