Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

One of the Emerald Lakes, explosion craters filled with mineral-tinted water, on Mount Tongariro in the Tongariro National Park on the central plateau, North Island, New Zealand

February 24, 2013 - Mushroom shaped ash cloud produced by powerful explosive eruption of Sakurajima volcano, Kagoshima, Japan.

February 24, 2013 - Ash cloud rising following eruption of Sakurajima volcano, Japan

February 24, 2013 - Powerful explosive eruption of Sakurajima volcano, Japan. Ash cloud rises against blue sky.

April 1, 2012 - Nighttime paroxysmal eruption at Mount Etna Volcano, Italy. Steam cloud rising as lava melts snow in Valle del Bove.

December 12, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

December 11, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

Crowd at Kilauea Eruption,1924

Water explosion, Timanfaya National Park, Lanzarote, Canary Islands, Spain, Europe

A flash of lightning in the ash cloud from the Eyjafjallajoekull Volcano while it ejects magma, lava flow in front of the glacier producing a water vapor cloud, Eyjafjallajoekull, Iceland, Europe

Lightning flashes in a charged cloud of ash from Eyjafjallajoekull Volcano, April 2010, Iceland, Europe

Panoramic shot of two clouds from the volcanic eruption in Eyjafjallajoekull Volcano, the black cloud at the rear is coming from the crater, the white cloud at the front is the result of a lava flow in a glacier, Eyjafjallajoekull, Iceland, Europe

Ash-covered landscape and a vapor cloud under the sun-drenched morning cloud of ash from Eyjafjallajoekull Volcano, Iceland, Europe

A young woman dressed in black and wearing boots walks along the ridge of the Hverfjall crater with Lake Myvatn in the background.

A young woman dressed in black and wearing boots walks along the ridge of the Hverfjall crater with steam rising in the volcanic background.

Fireworks in a city at dusk; Alberta, Canada

Hawaii, Big Island, Hawaii Volcanoes National Park, River of lava from Pu'u O'o fountain head

USA, Minneapolis, Minnesota, Bridge near downtown