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Ashen skies
Volcanic ash falls over Europe (9 of 15)
Smoke billows from a volcano in Eyjafjallajokull, April 16, 2010. A huge ash cloud from the Icelandic volcano spread out across Europe on Friday causing air travel chaos on a scale not seen since the September 11 attacks and costing airlines hundreds of millions of dollars. (REUTERS/Ingolfur Juliusson)
