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September 12, 2009 - Plume Geyser eruption, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Castle Geyser eruption with rainbow, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Castle Geyser eruption with rainbow, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Sawmill Geyser, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 11, 2009 - White Dome Geyser erupting, Lower Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

June 2006 - Ejection of lava during nighttime Strombolian eruption of Stromboli volcano, Aeolian Islands, Mediterranian Sea, Italy.

December 22, 2007 - Lava flowing from a small lava shield on the flank of Pacaya volcano, Guatemala.

May 21, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

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.

December 30, 2007 - Lava is flung high in the air during a nighttime eruption of Fuego volcano, Antigua, Guatemala.

Powerful Sea Blowhole Erupting Between Cliffs at Pancake Rocks, Punakaiki, Paparoa National Park, New Zealand

Distant view of the Seljalandsfoss waterfall with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern Iceland, Iceland, Polar Regions

Houses at foot of mountains with the ash plume of the Eyjafjallajokull eruption in the distance, southern area, Iceland, Polar Regions

Distant view of the Seljalandsfoss waterfall with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern Iceland, Iceland, Polar Regions

The cone geyser called Old Faithful erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The cone geyser called Old Faithful erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser steaming, with Old Faithful erupting behind, in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Great frigatebird (Fregata minor) feeding on erupting green sea turtle (Chelonia mydas) hatchlings in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

Castle Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Great frigatebird (Fregata minor) feeding on erupting green sea turtle (Chelonia mydas) hatchlings in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

The cone geyser called Old Faithful erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cliff Geyser erupting in the Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourist enjoying the huge waves in the Alofaaga blowholes on the south of Savaii, Samoa, South Pacific, Pacific

Old Faithful geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Stromboli volcano erupting, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourist enjoying the huge waves in the Alofaaga blowholes on the south of Savaii, Samoa, South Pacific, Pacific

Lone observer watches Grand Geyser erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Erupting Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rocket and Grotto cone geysers erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists gather to watch Strokker geyser (geysir), an erupting spring at Haukadalur, Iceland, Polar Regions

Grand Geyser erupts, forcing steam high into the air, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Geyser erupts, forcing steam high into the air, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lone Star Geyser erupts and creates rainbow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser and steamy surrounds, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Geyser erupts and steam blocks the sun, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Eruption of Riverside Geyser, Firehole River, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Eruptions at the Monti Calcarazzi fissure and the Piano del Lago cone on Mount Etna, that threatened tourist facilities and village in 2001, Sicily, Italy, Europe

Lava flow from the Monti Calcarazzi fissure that threatened Nicolosi on the south flank of Mount Etna in 2001, the Piano del Lago cone destroyed the Sapienza cable car, Sicily, Italy, Europe

Lava flow from the Monti Calcarazzi fissure on the flank of Mount Etna in 2001 which threatened Nicolosi below, Sicily, Italy, Europe

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of Gunung Merapi, a highly active volcano near Yogyakarta, Java, Indonesia, Southeast Asia, Asia

Lava flow from the Piano del Lago cone destroying the cable car above Rifugio Sapienza on the south flank of Mount Etna during the 2001 eruptions, Sicily, Italy, Europe

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Erupting geysers and mineral terraces, Whakarewarewa thermal area, Rotorua, South Auckland, North Island, New Zealand, Pacific

Strokkur at full height, the powerful geyser that erupts every 10 minutes, beside the now-inactive Geysir, southeast Iceland, Iceland, Polar Regions

Winter eruption, Old Faithful geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lava flow from the Monti Calcarazzi fissure on the southern flank of Mount Etna in 2001, threatening the town of Nicolosi below, Sicily, Italy, Europe

Illustration from Francois Valentijn's 18th century Oud Nieuw Oost-Indien showing the Island of Ternate, Moluccas Indonesia, Southeast Asia, Asia

Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Echinus Geyser, erupts every hour in Norris Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

View across bay south of Taormina to the east coast resort of Giardina-Naxos, and Mount Etna erupting in distance, island of Sicily, Italy, Mediterranean, Europe

Crowds of spectators watching Old Faithful Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Eruptions at the Monti Caltarazzo fissure and the Piano del Lago cone on Mount Etna, Sicily, Italy, Europe

Thermal pools at Geysir with Strokkur geyser erupting in the background, Geysir, southwest area, Iceland, Polar Regions

Pseudocraters at Kirkjubaejarklauster, formed by lava erupting onto a wet surface causing explosions of steam, Iceland, Polar Regions

Strokkur geyser erupting, in the Geysir hot springs area, Haukadalur geothermal area, Southwest Iceland