File:Pinatubo dust layer.jpg

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Space Shuttle (Mission STS 43) photograph of the Earth over South America taken on August 8, 1991, showing double layer of Pinatubo aerosol cloud (dark streaks) above high cumulonimbus tops.

Source: http://hvo.wr.usgs.gov/volcanowatch/2007/07_03_08.html

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