Paul D Stewart / Aerial view of Grand Prismatic thermal spring in Yellowstone National Park, USA. The bright colours are natural, coming from thermophile bacteria in the water. People can be seen walking on the raised...
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Hanne & Jens Eriksen / Fumarole in the Krafla volcano area, Iceland, June 2009
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Rob Tilley / River of lava flowing from the Pacaya volcano, Los Pocitos, Guatemala, Central America, June 2010
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Uri Golman / Volcanic eruption near Eyjafjallajoekull glacier, hot lava flowing down into the Thorsmork valley, Iceland, 24/03/2010. Volcano dormant since 1821.
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Uri Golman / Volcanic eruption near Eyjafjallajoekull glacier, hot lava flowing down into the Thorsmork valley, Iceland, 24/03/2010. Volcano dormant since 1821.
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Uri Golman / Helicopter flying over volcanic eruption near Eyjafjallajoekull glacier, Iceland, 24th March 2010. Volcano previously dormant since 1821.
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Juan Carlos Munoz / Eyjafjallajkull volcano erupting, Fimmvruhls area, Iceland, 7th of April 2010
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Juan Carlos Munoz / Eyjafjallajkull volcano erupting, Fimmvruhls area, Iceland, 7th of April 2010
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Juan Carlos Munoz / Eyjafjallajkull volcano erupting, Fimmvruhls area, Iceland, 5th of April 2010
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Jouan & Rius / People bathing in the spa waters of the Blue Lagoon with the geothermal power plant in the background, Grindavik, Iceland 2005
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Doug Perrine / Lava flowing from Lae'apuki bench into the sea during Pu'u O'o eruption, Kilauea Volcano, Hawaii, Jan 2000
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Igor Shpilenok / Boiling red clay mud pots with steam, caused by underground volcanic activity, Valley of the Geysers, Kronotsky Zapovednik Reserve, Russia.
