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Nacreous Clouds: The Highest of All Clouds [pic]

The image you see here shows Nacreous clouds, observed on January 6, 2011. These clouds appear about 80,000 feet above ground in the stratosphere and are observed in polar regions where the stratospheric temperature goes as low as -100 degrees Fahrenheit (-73 degrees C). This image was captured from Antarctica. The beautiful looking clouds do also have a sinister purpose, they are the site of chemical reactions that break down ozone, and contribute to the ozone hole.

Via TheAtlantic

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