Robert Harding

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860-288801 - 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.
832-382629 - Solfataras, fumaroles, mud pots, sulfur and other minerals, a woman on the viewing platform at the back, high-temperature geothermal area or Hverarond or Hverir, Namafjall mountains, Myvatn area, Norourland eystra, Iceland, Europe
832-378489 - Cracked mud in a dried up water hole, Painted Desert, Hopi Reservation, Navajo Nation Reservation, Arizona, Southwest, United States of America, USA, North America
832-378490 - Cracked mud in a dried up water hole, Painted Desert, Hopi Reservation, Navajo Nation Reservation, Arizona, Southwest, United States of America, USA, North America
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