Nacreous clouds

Nacreous clouds

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Credit: NATIONAL SCIENCE FOUNDATION/SCIENCE PHOTO LIBRARY

Caption: Nacreous Clouds Above Ross Island. Nacreous clouds above Ross Island, Antarctica. These polar stratospheric clouds at 80,000 feet are the highest of all clouds. They only occur in the polar regions when the stratospheric temperature dips below 100 degrees below zero Fahrenheit. They are also the site of chemical reactions that break down ozone in the upper atmosphere and contribute to the creation of the ozone hole above Antarctica.

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Keywords: antarctica, clouds, dusk, moody, nacreous clouds, nature, ozone, ozone hole, ross island, stratospheric clouds

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