Horses fight near the town of Sulfoss, Iceland as a volcano in Eyjafjallajokull erupts on April 17, 2010. (REUTERS/Lucas Jackson) Farmer Thorarinn Olafsson tries to lure his horse back to the stable as a cloud of black ash looms overhead in Drangshlid at Eyjafjoll on April 17, 2010. (REUTERS/Ingolfur Juliusson)
