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

Devil's Thumb, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North  America

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

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

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

Mammoth Hot Springs, 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

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 - Morning Glory 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.

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.

Palette Spring, Travertine Terraces, Mammoth Hot Springs, 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

One of the many bubbling mud pools in a hot spring area on the outskirts of Hveragerdi, a geothermal hot spot, with steam rising from fumeroles right in the middle of town, South West Iceland, Polar Regions

One of the many bubbling mud pools in a hot spring area on the outskirts of Hveragerdi, a geothermal hot spot, with steam rising from fumeroles right in the middle of town, South West Iceland, Polar Regions

One of the many bubbling mud pools in a hot spring area on the outskirts of Hveragerdi, a geothermal hot spot, with steam rising from fumeroles right in the middle of town, South West Iceland, Polar Regions

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

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

Puente del Inca, rock arch and old thermal bath of the sulphur spring above the Rio de las Cuevas, near Uspallata, Mendoza Province, Argentina, South America

Strokkur Geyser, Haukadalur Valley, Golden Circle, Su√∞urland, Sudurland, Southern Iceland, Iceland, Europe

Hot spring, sinter terraces, Hveravellir high-temperature or geothermal region, Highlands, Iceland, Europe

Solfataras, fumaroles, mud pools, sulfur and other minerals, viewing platform, steam, Hveraroend geothermal area, N√°mafjall mountains, M√Ωvatn area, Nor√∞urland eystra, the north-east region, Iceland, Europe

Blue water pool, Bl√°hver hot spring, Hveravellir high-temperature or geothermal region, Highlands, Iceland, Europe

Solfataras, fumaroles, mud pools, sulfur and other minerals, steam, Hveraroend geothermal area, N√°mafjall mountains, M√Ωvatn area, Nor√∞urland eystra, the north-east region, Iceland, Europe

Blue water pool, Bl√°hver hot spring, Hveravellir high-temperature or geothermal region, Highlands, Iceland, Europe

Steaming creek, hot springs and Rhyolite Mountains, Hveradallir high temperature area, Kerlingarfjoell, highlands, Iceland, Europe

Solfataras, fumaroles, mud pools, sulfur and other minerals, steam, Hveraroend geothermal area, N√°mafjall mountains, M√Ωvatn area, Nor√∞urland eystra, the north-east region, Iceland, Europe

Tourists watching steam and a water spout, Strokkur geyser, backlit, Haukadalur valley, Golden Circle, Su√∞urland, Sudurland, southern Iceland, Iceland, Europe

Tourists watching a steam and water column, Stokkur geyser against the light, Haukadalur Valley, Golden Circle, Su√∞urland, South Iceland, Iceland, Europe

People watching Strokkur Geyser errupting, fountain, hot springs, Haukadalur, Golden Circle, Iceland, Scandinavia, Northern Europe, Europe

Break of dawn at the waterside of Yellowstone Lake, Yellowstone National Park, Wyoming, USA, United States of America

Steaming fumarole, solfatar in the geothermal area Hveraroend, also Hverir or Namaskard, Sun Star, North Iceland, Iceland, Europe

A white, round building with round windows and arches by the sea, next to it stands a palm tree, thermal springs, thermal baths, thermal baths of Kallithea, Kallithea, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Inner courtyard of a circular building with glass roof, plants and benches, down to earth with mosaic tiles, thermal springs, thermal baths, thermal baths of Kallithea, Kallithea, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Detail of an artistically designed mosaic with a symmetrical pattern in black and white, thermal springs, thermal baths, thermal baths of Kallithea, Kallithea, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Interior of a circular building with open arches and a view of the sea, the floor is artfully tiled, thermal springs, thermal baths, thermal baths of Kallithea, Kallithea, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Effluent area of the Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, Mammoth Hot Springs Terraces in Yellowstone National Park, Idaho, Montana, Wyoming, America

Mound and Jupiter Spring Terrace, Main Terrace, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Sunset Lake, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Orange Mound Road, Upper Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, in front of Mount Everts, Mammoth Hot Springs Terraces in Yellowstone National Park, Idaho, Montana, Wyoming, America

Minerva Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Geothermal power plant, Nesjavellir power plant, Hengill region, Iceland, Scandinavia, Northern Europe, Europe

Futuristic house, geothermal power plant, Nesjavellir power plant, Hverageri, Hengill region, Iceland, Scandinavia, Northern Europe, Europe

Steppe, open plain, Polloquere springs, thermal baths, Salar de Surire, Salt Lake, Reserva Nacional de las Vicunas, Lauca National Park, Altiplano, Norte Grande, Northern Chile, Chile, South America

Geothermal power plant, Nesjavellir power plant, Hengill region, Iceland, Scandinavia, Northern Europe, Europe

Geothermal region of Gunnuhver in southern Iceland with steam from the countless holes and fractures in the earth's crust, Iceland, Europe

Blahver, blue spring, the most beautiful blue water pool in Hveravellir in the Highlands, in front of Oeskjuholt, a steaming calc-sinter mound which looks like a mini volcano, below a rainbow, Hveravellir, Iceland, Europe

Steam from the countless holes and fractures in the earth's crust, the Solfatarten, behind it a geothermal power station and a factory for salt extraction, which is operated with geothermal energy, geothermal region of Gunnuhver, southern Iceland, Iceland

Blahver, blue spring, the most beautiful blue water pool in Hveravellir in the Highlands, in front of Oeskjuholt, a steaming calc-sinter mound which looks like a mini volcano, below a rainbow, Hveravellir, Iceland, Europe

The geothermal Nesjavellir power station delivers energy via long pipelines and power-cables as far as Reykjavik, Iceland, Europe

Krossneslaug, outdoor pool with hot spring by the sea, Krossnes, Arnes, Strandir, Westfjords, Iceland, Europe

Guy with camera, Geothermal area, Redwoods Forest, Whakarewarewa, Rotorua, North Island, New Zealand, Oceania

Mud Volcano, steaming thermal spring in the back, Dragon's Mouth Spring, Yellowstone National Park, Wyoming, USA, North America

Orange and red mineral deposits, steaming hot springs, morning sun, West Thumb Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Red mineral deposits and green algae at a thermal spring, steaming hot springs, Whirligig Geyser, Noris Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

Tourists standing on the edge of Grand Prismatic Spring, Yellowstone National Park, Wyoming, United States, North America

Detailed view of the discoloration caused by bacteria and algae on a geyser, Geyser Hill, Old Faithful Area, Yellowstone National Park, Wyoming, USA, North America