In 2010, a previously little-known Icelandic volcano erupted twice, sending a huge plume of volcanic ash all over Europe. The ash cloud grounded flights for days, causing inconvenience for millions of passengers. Reena Stanton-Sharma talks to Icelandic geophysicist and Eyjafjallajökull-watcher, Sigrun Hreinsdottir.
(Photo: The awesome power of Eyjafjallajökull. Credit: Getty Images)