Scientist viewing steaming crater after Grimsvotn eruption, Iceland

- Image ID: C7GM32
ARCTIC IMAGES / Alamy Stock Photo
Image ID: C7GM32
The eruption began on 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 in Iceland and parts of Europe. Grimsvotn is Iceland's most frequently erupting basalt volcano located under Vatnajokull Ice Cap; the largest glacier in Europe. The prior eruption was in 2004. Date photographed May 30, 2011
Location: Iceland