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Statue of Paul McCartney outside the Hard Day's Night Hotel, Liverpool, Merseyside, England, United Kingdom, Europe

Hiker contemplating the Lac du Lauvitel (1530 m) on the GR 54 long-distance hiking trail, Tour de l'Oisans et des Ecrins, Veneon valley, Ecrins National Park, Isere, France

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.

Colourwater of leaves in Reserve of Muniellos spring, Cangas de Narcea Muniellos beech asturies spain

Le Glacier Blanc (3023m), view on Mount Pelvoux (3932m), Valley of Vallouise, Brian?onnais region, Ecrins National Park, Hautes-Alpes, France