What are the colorful, iridescent clouds that form in the stratosphere and resemble mother-of-pearl?
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Nacreous clouds, also known as mother-of-pearl clouds, form in the extremely cold winter stratosphere. They diffract sunlight into brilliant pastel colors, creating a stunning visual display. However, they also play a harmful role in the environment by hosting chemical reactions that destroy the ozone layer. Photo: Alan Light from Charlotte, USA. At Commons: Alan R Light (talk · contribs), Wikimedia Commons, CC BY 2.0.
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Source: Wikipedia (CC BY-SA)
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