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Panoramic aerial view of the active Erta Ale volcano caldera, Danakil Depression, Afar Region, Ethiopia, Africa

Panoramic aerial view of sunset over the active Erta Ale volcano crater, Danakil Depression, Afar Region, Ethiopia, Africa

Aerial view of stone huts on top of majestic Erta Ale volcano, Danakil Depression, Afar Region, Ethiopia, Africa

A thermal mud pool bubbles near to Wai-o-tapu Thermal Wonderland, Rotorua, North Island, New Zealand, Pacific

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

Rainbow Geyser and surreal the colors that the different bacteria create in these geysers, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steam locomotive on the Nilgiri Mountain Railway, between Ooty and Mettupalayam, Tamil Nadu, India, South Asia

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

Steam train crossing the Ribblehead Viaduct, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Tourists at the Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Pre-dawn light on the Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Tourists at the Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Pre-dawn light on the Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Pre-dawn light on the Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Tourists at the Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Tourists at the Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Tourists at the Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Geysers del Tatio (El Tatio), the third largest geyser field in the world, Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Champagne Pool, Wai-O-Tapu Thermal Wonderland, Rotorua, Bay of Plenty, North Island, New Zealand, Pacific

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

Steamboat Geyser, the worlds tallest active geyser, steaming in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Porcelain Basin, in the Norris Geyser Basin area, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Geyser, in the Norris Geyser Basin area, 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

Geysers at Banos Termales in the Eduardo Avaroa Andean Fauna National Reserve, Potosi Department, Bolivia, South America

The Jacobite steam train travelling to Mallaig from Fort William, on the Glenfinnan Viaduct, Highlands, Scotland, United Kingdom, Europe

Yellowstone thermal features emit steam backlit by sun, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North AmericaWyoming, USA

View of a waterfall on the Bergen Railway route from Myrdal to the town of Flam, Norway, Scandinavia, Europe

Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

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

November 2006 - Lava flowing from base of hornito during eruption of Mount Etna volcano, Sicily, Italy.

November 2006 - Lava flowing from base of hornito during eruption of Mount Etna volcano, Sicily, Italy.

January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.

Old steam trains from the Dorrigo railway line, Dorrigo National Park, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Lone American bison with steaming thermal features in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steam train crosses the Landwasser Viadukt, UNESCO World Heritage Site, Filisur, Albula Valley, Graubunden, Switzerland, Europe

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

Emerald Spring in the Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steam and turquoise depths at Black Pool, dawn, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steam emitted from the New York Steam System, dating back to 1882 providing steam to heat, cool or disinfect around 1,700 buildings, New York, United States of America, North America

October 19, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash and steam cloud are blown away by wind. View over industrial area of Kliuchi town with Kamchatka River in foreground.

October 15, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia.
Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

April 1, 2012 - Lava flowing into Valle del Bove at Mount Etna Volcano, Italy, following paroxysmal eruption.

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

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

September 12, 2009 - Steam rising over Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Grand Prismatic Spring, Midway 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.

November 2007 - Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Orange coloration in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Bubbles rising in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Champagne Pool and Artist's Palette, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

November 2007 - Aerial view of White Island (Whakaari) volcano with central acidic crater lake, Bay of Plenty, New Zealand.

January 22, 2011 - Lava Lake in bottom of summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.