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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, 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, terraces of 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.

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

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

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

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

Sol de Manana, a geothermal field in Sur Lipez Province in the Potosi Department, Bolivia, South America

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

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

Rainbow Geyser, 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

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

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

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

Boiling mud pots in the Eduardo Avaroa Andean Fauna National Reserve, Potosi Department, Bolivia, South America

Boiling mud pots in the Eduardo Avaroa Andean Fauna National Reserve, Potosi Department, Bolivia, South America

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

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

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

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

Aerial view taken by drone of iceberg in Jokusarloon Glacier Lagoon during a summer day, 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 fumarole with sulphur deposits in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, 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

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

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

Geothermal Reykjanes power plant and smoking fumarole at Gunnuhver hot spring, Reykjanes Peninsula, Iceland

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

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

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

Cliff Geyser erupting in the Black Sand Basin, 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

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

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

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

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

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