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Tourists looking at hot springs and sulphur ponds, Dallol, Danakil Depression, Afar Region, Ethiopia, Africa

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 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.

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

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.

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

Fairmont Banff Springs Hotel viewed from Sulphur Mountain top, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Ethiopia; Afar region; Danakil Desert; Danakil Depression; Dallol geothermal area; hot sulfur springs; cone-like formation in intense yellow, red and green tones

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

Thermal spring in Saturnia with sulphur-containing water of the Monte Amiata Manciano Toskana Italien

Geothermal area with sulphur deposits and acidic salt lakes, Dallol, Danakil Valley, Ethiopia, Africa

Puente del Inca, old thermal bath of the sulphur spring, near Uspallata, Mendoza Province, Argentina, South America

Geothermal area with sulphur deposits and acidic salt lakes, Dallol, Danakil Valley, Ethiopia, Africa

Geothermal area with sulphur deposits and acidic brines, Dallol, Danakil depression, Ethiopia, Africa

Geothermal area with sulphur deposits and acidic brines, Dallol, Danakil depression, Ethiopia, Africa

The basin of hot sulphur spring in Bagno Vignoni and Hotel Le Terme at night, Orcia Valley, Tuscany, Italy, Europe

Geothermal power plant which uses the hot water coming from drill holes 2 km deep near the volcano Krafla Iceland

Sulfur vapor, petrified trees in New Blue Spring Road, limestone sinter terraces, steaming geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America

Geothermal area Hveraroend near lake Myvatn and the ring road during winter with mud pools , fumaroles and solfataras. europe, northern europe, scandinavia, iceland, February

Geothermal area Hveraroend with mudpots, fumarales and solfataras near lake Myvatn and the ring road. europe, northern europe, iceland, February

Geothermal area Hveraroend near lake Myvatn and the ring road during winter with mud pools , fumaroles and solfataras. europe, northern europe, scandinavia, iceland, February

Reykjanesviti lighthouse with steam hovering over the hot springs of the geothermal area Gunnuhver and teh geothermal power plant Sudurnes. europe, northern europe, iceland, February

Geothermal area Hveraroend near lake Myvatn and the ring road during winter with mud pools , fumaroles and solfataras. europe, northern europe, scandinavia, iceland, February

R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.

R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.

Reflections on Rio Tinto, near its source, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.

Clay loaded with iron oxides and dried out, Rio Tinto, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.