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

September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Chromatic Pool Hot Spring, 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.

February 11, 2008 - Dallol geothermal area, egg-shaped fumarole deposits formed in salt deposits of brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

View of snow covered landscape in Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

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

Sulphur and other minerals at an active fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Sulphur and other minerals at an active fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Mineral deposits from geothermal steam vents at Te Puia, Gisborne District, North Island, New Zealand, Pacific

Large carved face at Bukit Kasih, a volcanic tourist park with fumarole fields, a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming volcanic fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole field at Bukit Kasih, a tourist volcanic park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole field at Bukit Kasih, a tourist volcanic park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Aerial view taken by drone of iceberg in Jokusarloon Glacier Lagoon during a summer day, Iceland, Polar Regions

Elevated view of Cusco (Cuzco) Cathedral and Church of the Society of Jesus, UNESCO, Cusco (Cuzco), Cusco Province, Cusco Region, Peru, South America

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

Steaming fumaroles, sulphur and volcanic strata in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Boiling water at a steaming fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

The Gudunvher geothermal plant, with the Reykjanesviti lighthouse, at the southwestern tip of the Reykjanes peninsula, Iceland, Polar Regions

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

Steaming fumaroles by Lake Linow, a popular volcanic attraction and geothermal centre south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Geothermal mud pot in Biscuit Basin in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tufts of grass and El Misti and Chachani volcanoes, Salinas y Aguada Blanca National Reserve, Arequipa Region, Peru, South America

Canary Spring, Travertine Terraces, Mammoth Hot Springs, 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

Boy fishing on dock by changing colour Lake Linow, a popular volcanic attraction and geothermal centre south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Worship houses of five major religions at Bukit Kasih, a volcanic tourist park with a world peace themed tower, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia Asia

View of hot springs in the Haukadalur valley on the slopes of Laugarfjall hill, Iceland, Polar Regions

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

The Blue Crater Lake of Viti, which appeared after an eruption in 1875, part of the sulphurous geothermal area of Namafjall, Reykjahlio, Iceland

Dramatic volcanic landscape with mudpools in geothermal area on Reykjanes Peninsula, near Keflavik, Iceland, Polar Regions

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

Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steaming fumaroles, sulphur and volcanic strata in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole with sulphur deposits in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Natural pool of boiling water, geothermal area, Te Puia, Gisborne District, North Island, New Zealand, Pacific

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

Sulfurous vents in the geothermal area of Te Puia, Gisborne District, North Island, New Zealand, Pacific

Aerial abstract view of the geothermal area near to Icleandic southern coast, Iceland, Polar Regions

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

Colourful Emerald Pool, Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America