Volcanic scientists collect samples of ash to send to labs to analyze its content, in eastern Iceland. Scientists said the Eyjafjallajokull eruption could have a regional effect on Europe's climate -- but only provided it went on for a matter of years. (AFP/Omar Oskarsson)
A church, engulfed in ash from a nearby volcano, is seen near Vik April 16, 2010. A huge ash cloud from an Icelandic volcano spread out across Europe on Friday causing air travel chaos on a scale not seen since the Sept. 11 attacks and costing airlines hundreds of millions of dollars. REUTERS/Ingolfur Juliusson (ICELAND - Tags: DISASTER ENVIRONMENT RELIGION)