A drifting ash cloud from a small eruption of Cleveland Volcano is pictured in this annotated NOAA satellite image taken December 29, 2011. The ash cloud is the yellow and orange feature located on the southwest tip of Umnak Island. The brief explosive eruption began at around 4:15 AM AST, and the cloud had drifted 35 miles to the east at an altitude of about 15,000 above sea level by the time is was observed in this satellite image. [Photo/Agencies]
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