The Lewisian gneiss stone circle at Callanish on an early autumnal morning with clouds forming above, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe

The Lewisian gneiss stone circle at Callanish on an early autumnal morning with clouds forming above, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe

Magalithic standing stones forming part of Castlerigg Stone Circle in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Interesting lenticular cloud formations forming over the island of South Georgia in the Southern Ocean

Interesting lenticular cloud formations forming over the island of South Georgia in the Southern Ocean

Interesting lenticular cloud formations forming over the island of South Georgia at sunset in the Southern Ocean

Stone outcrops forming rock formations, Vale da Lua, Chapada dos Veadeiros National Park, UNESCO World Heritage Site, Goias, Brazil, South America

Stone outcrops forming rock formations, Vale da Lua, Chapada dos Veadeiros National Park, UNESCO World Heritage Site, Goias, Brazil, South America

People wearing red forming circle around North Pole, Arctic

People wearing red forming circle around North Pole, Arctic

Stone outcrops forming rock formations, Vale da Lua, Chapada dos Veadeiros National Park, UNESCO World Heritage Site, Goias, Brazil, South America

Clouds forming over glacial iceberg at Devil Island, Weddell Sea, Antarctica, Polar Regions

Sea ice forming as the temperature drops near Pleneau Island, Antarctica, Polar Regions

Clouds forming over snow-capped mountains in Penola Strait, Antarctica, Polar Regions

Adiabatic clouds forming on the 1900m high karst limestone Bohinj Ridge Mountains in the Julian Alps, as rising air cools, with grasses and Dwarf pines (Pinus mugo) growing between areas of exposed rock, Triglav National Park, Slovenia.

Interesting cloud formations forming over the island of South Georgia in the Southern Ocean

Rowing boats are tight together at Phewa Lake, dark thunderstorm clouds are rising at the sky, Pokhara, Kaski District, Nepal, Asia

Lonely road through desert, thunderstorm forming, Valley of Fire, Nevada, USA, North America

Aiguilles d'Arves mountain in the morning light, Pelvoux, Dauphine Alps, Savoie, France, Europe

Supercell thunderstorm clouds show off the power of mother nature. Massive clouds build and unleash powerful storms creating a beautiful and awe inspiring spectacle; Colorado, United States of America

Amazing clouds over the landscape of the American mid-west as supercell thunderstorms develop; Nebraska, United States of America

Supercell thunderstorm clouds show off the power of mother nature. Massive clouds build and unleash powerful storms creating a beautiful and awe inspiring spectacle; Colorado, United States of America

View of geometric patterns on rocky hills referred to as Brain Rocks, against a cloudy sky forming part of the alien landscape of amazing lines, contours and shapes in the wondrous area known as White Pocket, situated in Arizona, Arizona, United States of America

Stunning view of the sandy beach with surf forming a zigzag pattern in the foam next to the large, boulders lining the shores at The Baths, a famous beach in the BVI's, Virgin Gorda, British Virgin Islands, Caribbean

Scottish Borders, Scotland; Tire Tracks Forming A Road Along A Fence With A House Among The Fields

Scottish Borders, Scotland; Tire Tracks Forming A Road Along A Fence With A House Among The Fields

Smokestack, Washington, United States of America

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.

Les Terres Noires de Robine sur Galabre under the snow. Jurassic (Toarcian) marls rich in organic matter, tender and very sensitive to gullying, colonized mainly by Scots pines and forming remarkable reliefs in the Digne Geological Reserve, Alpes de Haute Provence, France.