Kawah Ijen and its turquoise acid crater lake, Java, Indonesia, Southeast Asia, Asia

Panorama of sulphur worker appearing out of toxic fumes at Kawah Ijen volcano, East Java, Indonesia, Southeast Asia, Asia

Kawah Ijen's acidic turquoise blue crater lake, Java, Indonesia, Southeast Asia, Asia

Loch Ba and the Black Mountains in autumn, an acidic low nutrient river formed in a catchment area of peat moorland, Rannoch Moor, Highland region, Scotland, United Kingdom, Europe

Close up on pile of limes, Debre Berhan, Ethiopia

Kilauea Eruption 2018

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 salt lakes, Dallol, Danakil Valley, Ethiopia, Africa

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

Acidic pools, mineral formations, salt deposits in the crater of Dallol Volcano, Danakil Depression, Afar Region, Ethiopia

Acidic pools, mineral formations, salt deposits in the crater of Dallol Volcano, Danakil Depression, Afar Region, Ethiopia

Rio Tinto red river reddish hue due to iron copper and sulfur dissolved in the water habitat with extreme conditions for life forms Andalusia

Rio Tinto red river reddish hue due to iron copper and sulfur dissolved in the water habitat with extreme conditions for life forms Andalusia

aerial view Rio Tinto red river reddish hue due to iron copper and sulfur dissolved in the water habitat with extreme conditions for life forms Andalusia

Rio Tinto red river reddish hue due to iron copper and sulfur dissolved in the water habitat with extreme conditions for life forms Andalusia

Rio Tinto red river reddish hue due to iron copper and sulfur dissolved in the water habitat with extreme conditions for life forms Andalusia

Rio Tinto red river reddish hue due to iron copper and sulfur dissolved in the water habitat with extreme conditions for life forms Andalusia

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.