Volcano in Iceland

This satellite image provided by NASA and acquired Sunday May 22, 2011 shows the plume of dense ash from the Grimsvotn volcano in Iceland as it casts a shadow to the west. The plume from the volcano was bearing down on Scotland and set to disrupt flights there as early as Monday night, May 23, 2011, Britain's Met Office said.

In this photo taken on Saturday, May 21, 2011, smoke plumes from the Grimsvotn volcano, which lies under the Vatnajokull glacier, about 120 miles, (200 kilometers) east of the capital, Rejkjavik, which began erupting Saturday for the first time since 2004. Iceland closed its main international airport and canceled domestic flights Sunday as a powerful volcanic eruption sent a plume of ash, smoke and steam 12 miles (20 kilometers) into the air.

In this photo taken on Saturday, May 21, 2011, smoke plumes from the Grimsvotn volcano.

In this photo taken on Saturday, May 21, 2011, smoke plumes from the Grimsvotn volcano.

Icelandair's stranded Boeing 757 aircraft named after the Icelandic volcano Eyjafjallajokull is parked at a remote stand at Arlanda airport north of Stockholm, Monday May 23, 2011. The aircraft is unable to return home after an ash cloud from the volcano Grimsvotn closed airports in Iceland Sunday. The European Union says ash from an Icelandic volcano could soon affect the airspace over Britain and Ireland.

A cloud of smoke and ash is seen over the Grimsvoetn volcano on Iceland on May 21, 2011.

A woman waits with her luggage at Keflavik airport, Keflavik, Iceland Sunday May 22, 2011 as Iceland closed its main international airport and canceled domestic flights.

Smoke rises from the Grimsvotn volcano, Saturday, May 21, 2011 in Reykjavik, Iceland.

Vehicles are covered in ash near to Kirkjubaearklaustur, approx. 260 km from Reykjavik, Iceland, Monday, May 23, 2011.

A rescue team is seen near to Kirkjubaearklaustur, approx. 260 km from Reykjavik, Iceland, Monday, May 23, 2011.

Farmers Thormar Eller and Henny Hrund go to check their livestock as an ash cloud is seen in background, near Kirkjubaearklaustur, approx. 260 km from Reykjavik, Iceland, Monday, May 23, 2011.

A farmer's footprint is seen in the ash near to Kirkjubaearklaustur, approx. 260 km from Reykjavik, Iceland, Monday, May 23, 2011.

A rescue team is seen near to Kirkjubaearklaustur, approx. 260 km from Reykjavik, Iceland, Monday, May 23, 2011.

A bird is lit by a vehicle's headlights in the middle of the day, as it sits on the road in an ash cloud, near to Kirkjubaearklaustur, approx. 260 km from Reykjavik, Iceland, Monday, May 23, 2011.

A member of a rescue team checks on a farmer near to Kirkjubaearklaustur, approx. 260 km from Reykjavik, Iceland, Monday, May 23, 2011. A dense cloud of ash from an Icelandic volcano was being blown toward Scotland Monday, forcing two airlines to cancel their flights, U.S. President Barack Obama to cut short his visit to Ireland and carriers across Europe to fear a repeat of the huge disruptions that stranded millions of passengers a year ago.