Rust-colored volcanic tuff cliffs above a dark material filled glacier at Brown Bluff, eastern side of the Tabarin Peninsula, Weddell Sea, Antarctica, Polar Regions

Rust-colored volcanic tuff cliffs of Brown Bluff, eastern side of the Tabarin Peninsula, Weddell Sea, Antarctica, Polar Regions

Rust-colored volcanic tuff cliffs of Brown Bluff, eastern side of the Tabarin Peninsula, Weddell Sea, Antarctica, Polar Regions

Rust-colored volcanic tuff cliffs above a dark material filled glacier at Brown Bluff, eastern side of the Tabarin Peninsula, Weddell Sea, Antarctica, Polar Regions

Autumn leaves in England

Anchor chain with a shipwreck, Ushuaia, Tierra del Fuego, Patagonia, Argentina, South America

Shipwreck Plassy, since 1960, Inisheer island, County Galway, Republic of Ireland, Europe

Shipwreck, Ushuaia, Tierra del Fuego, Patagonia, Argentina, South America

Old tracks

Panorama of Golden Gate Bridge San Francisco California USA

Traffic on the Golden Gate Bridge San Francisco California USA

Golden Gate Bridge San Francisco California USA

Golden Gate Bridge San Francisco California USA

Golden Gate Bridge San Francisco California USA

Golden Gate Bridge San Francisco California USA

Golden Gate Bridge San Francisco California 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.

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.