Under Grimsvotn Volcanic Eruption in the Vatnajokull Glacier, Iceland - Fotografía de stock

Flying under the eruption can see volcanic ash which is hanging in the sky forming these unique clouds. Eruption began May 21, 2011 spewing tons of ash; initially the plume was over 20 kilometers high. Volcanic ash is an extreme danger to jet engines closing airspace. Grimsvotn is a subglacial basalt volcano and Iceland's most frequently erupting volcano. The prior eruption was in 2004. Date photographed May 22, 2011