World's most active volcanoes

A few hundred degrees separates this pool of fiery orange magma in Italy’s Mount Etna from its hardened, gray crust. At nearly 11,000 feet (3,353 meters)

A NASA image released on May 22, 2011 shows smoke billowing from Grimsvoetn, Iceland's most active volcano.

A plume of smoke rises from the crater of Mount Shinmoedake in the Kirishima mountain range of Kagoshima prefecture on Japan's southern island of Kyushu on February 4, 2011

A wisp of smoke escapes from Mount St. Helens’ dramatic eggshell-shaped crater after an eruption

A woman flee as Mount Merapi releases volcanic materials into the air in Cangkringan, Yogyakarta, Indonesia, Monday, Nov. 1, 2010.

An Indonesian man watches as Mount Merapi erupts in Hargobinangun, Yogyakarta, Indonesia, Wednesday, Nov. 3, 2010.



Cleveland Volcano releases a plume of ash that rises almost 20,000 feet (6,000 meters) above the North Pacific Ocean

In this photo taken March 6, 2011 and provided by the US Geological Survey, Lava spatters above the fissure just west of the base of Pu'u O'o crater near Volcano Hawaii.

In this photo taken Tuesday, March 8, 2011 and provided by the US Geological Survey, a view looking down onto the northeastern vent of the Kamoamoa eruption is seen in Hawaii Volcanoes

Lava flows into a valley in southern Iceland near the Eyjafjallajökull volcano.

Lava free-falls into the sea from Kilauea Volcano in Hawaii, July 26, 2002.

Mount Bromo spews volcanic materials as it erupts in this aerial shot taken from an Indonesian Air Force airplane that flies over Probolinggo, East Java, Indonesia on Monday, Nov. 29, 2010

Mount Semeru

Pahoehoe lava flows on Kilauea volcano in Hawaii Volcanoes National Park

Residents of Irosin township, Sorsogon province, pause to watch at Mount Bulusan volcano as it spews ash two kilometers into the sky Monday Feb. 20, 2011

The Tungurahua Volcano spews ashes during an eruption as seen from Cotalo, Ecuador, Friday, April 29, 2011.

This picture made available Thursday, Jan. 13, 2011, shows lava overflowing from the eastern rim of the erupting pit crater of Mount Etna, Sicily, Wednesday, Jan. 12, 2011.

Volcanic smoke rises from the crater on Mount Shinmoedake in the Kirishimna range on Japan's southernmost main island of Kyushu Tuesday, Feb. 1, 2011.

White smoke rises from the crater on Mount Shinmoedake in the Kirishimna range on Japan's southernmost main island of Kyushu Tuesday, Feb. 1, 2011.