Iceland Volcano Erupts

May 22, 2011: This satellite image provided by NASA shows the plume of dense ash from the Grimsvotn volcano in Iceland as it casts a shadow to the west. (AP)

May 22, 2011: This satellite image provided by NASA shows the plume of dense ash from the Grimsvotn volcano in Iceland toward the upper center of the frame. (AP)

May 23, 2011: An SAS Boeing 737 aircraft takes off behind Icelandair's stranded Boeing 757 aircraft named after the Icelandic volcano Eyjafjallajokull is parked at a remote stand at Arlanda airport, unable to return home after an ash cloud from the volcano Grimsvotn closed airports in Iceland on Sunday. (AP)

May 21, 2011: In this image from amateur video, smoke from the Grimsvotn volcano in Iceland is seen from a plane. (AP)

May 21, 2011: Smoke plumes from the Grimsvotn volcano, which lies under the Vatnajokull glacier, about 120 miles east of the capital, Rejkjavik. It began erupting Saturday for the first time since 2004, forcing Iceland to close its main international airport and cancel domestic flights. (AP)

May 21, 2011: Smoke plumes from the Grimsvotn volcano, which lies under the Vatnajokull glacier, about 120 miles east of the capital, Rejkjavik. It began erupting Saturday for the first time since 2004, forcing Iceland to close its main international airport and cancel domestic flights. (AP2011)

May 21, 2011: Smoke plumes from the Grimsvotn volcano, which lies under the Vatnajokull glacier, about 120 miles east of the capital, Rejkjavik. It began erupting Saturday for the first time since 2004, forcing Iceland to close its main international airport and cancel domestic flights. (AP2011)

May 21, 2011: Smoke plumes from the Grimsvotn volcano, which lies under the Vatnajokull glacier, about 120 miles east of the capital, Rejkjavik. It began erupting Saturday for the first time since 2004, forcing Iceland to close its main international airport and cancel domestic flights. (2011 AP)

Map locates Grimsvotn volcano in Iceland that has started erupting (AP Graphic)