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Tall hoodoo towers in the valley below Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

A sloping red sand dune above Hamilili Wash in Petrified Forest National Park, Arizona, United States of America, North America

Dead Sea, Israel, Jordan, True Colour Satellite Image. The Dead Sea, Israel, Jordan, true colour satellite image. The Dead Sea and sedimentation tanks in turquoise. Image taken on 14 August 1987 using LANDSAT data.

Aerial view, sinter steps, sinter terraces, lime sinter terraces, Egerszalok, Egerszalok, Eger, Heves, Hungary, Europe

The Patriot Coal Corporation's Samples mine, which uses the technique of mountaintop removal to mine coal. The mountain tops are stripped away and dumped in valleys to get at the coal below. The Samples mine has been temporarily closed due to declining de

Camels loaded with rock salt slabs walk at sunset through a salt lake, salt desert, Danakil depression, Ethiopia, Africa

Sedimentation tanks at Lixao dump in the satellite city of Estrutural near Brasilia, Distrito Federal, Brazil, South America

Mound and Jupiter Spring Terrace, Main Terrace, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Minerva Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Orange and red mineral deposits, steaming hot springs, morning sun, West Thumb Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Red mineral deposits and green algae at a thermal spring, steaming hot springs, Whirligig Geyser, Noris Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Donkeys transport salt blocks from the salt mines, Assale Salt Lake, Lake Assale, Danakil Valley, Afar Region, Ethiopia, Africa

Locals piling up salt with a wooden board, Salinas de Maras salt pans, created by the Incas and still in operation, Pichingote, Cusco region, Andes, Peru, South America

Child playing with a wooden board, Salinas de Maras salt pans, created by the Incas and still in operation, Pichingote, Cusco region, Andes, Peru, South America

Travertine terrace formations, UNESCO World Heritage Site, Pamukkale, Denizli Province, Aegean Region, Turkey, Asia

Desert, Historic Borax Mine, 20 mule team car, Harmony Borax Works, Death Valley National Park, California, USA, North America

Dead camelthorn trees (Acacia erioloba) in Deadvlei, Sossusvlei, Namib Desert, Namib-Naukluft National Park, Namibia, Africa

Meerkat (Suricata suricatta), standing in the grass savannah and staring watchfully into the distance, Makgadikgadi salt pans, Botswana, Africa

Afar shepherd leads a dromedary caravan loaded with rock salt plates (halite) across the Lake Assale (Lake Assale), Danakil Depression, Afar Region, Ethiopia, Africa

Afar nomads loading dromedary with salt plates from dry salt lake, near Dallol, Danakil Depression, Afar Region, Ethiopia, Africa

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

Camels loaded with rock salt slabs walk at sunset through a salt lake, salt desert, Danakil depression, Ethiopia, Africa

Camels loaded with rock salt slabs walk at sunset through a salt lake, salt desert, Danakil depression, Ethiopia, Africa

Two Giraffes (Giraffa camelopardalis) standing on the salt pan in Etosha National Park, Namibia, Africa

Steaming hot spring with sun star, Colored mineral deposits, Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Orange and red mineral deposits, steaming hot springs, morning sun, West Thumb Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Red mineral deposits and green algae at a thermal spring, steaming hot springs, Noris Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Red mineral deposits at a thermal spring, Noris Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Riesenburg cave, natural karst cave ruin of Frankendolomite, geotope, natural monument, in the back climber at rock face, near Engelhardsberg, district of Markt Wiesenttal, Upper Franconia, Franconian Switzerland, Franconia, Bavaria, Germany, Europe

Steaming hot spring, dead trees in the back, Noris Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Turquoise clear water of a hot spring, Sapphire Pool, Black Sand Basin and Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

Yellow bacteria and algae in a hot spring at Black Sand Basin and Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

Dead trees at Opalescent Pool with mineral deposits, Black Sand Basin, Yellowstone National Park, Wyoming, USA, North America

Tourist on a logging road in front of steaming hot spring, Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

Black Opal Pool, Hot Spring, Yellow Algae and Mineral Deposits, Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

Turquoise clear water of a hot spring, Sapphire Pool, Black Sand Basin and Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

Sedimentation tanks at Lixao dump in the satellite city of Estrutural near Brasilia, Distrito Federal, Brazil, South America

Tourists standing on the edge of Grand Prismatic Spring, Yellowstone National Park, Wyoming, United States, North America

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

Svartifoss, "Black Waterfall, " with basalt columns, Skaftafell National Park, southeast Iceland, Iceland

Erupting Pohutu Geyser with rainbow, sinter terraces, Te Puia, Whakarewarewa, Rotorua, Bay of Plenty, New Zealand, Oceania

Sunrise over the lava field, shield volcano Erta Ale, Danakil depression, Afar region, Ethiopia, Africa

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

Coastal road through sand dunes, Parque Natural de Corralejo, Fuerteventura, Canary Islands, Spain, Europe

Dromedaries lie in dry salt lake, are loaded with salt plates, near Dallol, Danakil depression, Afar region, Ethiopia, Africa

Sedimentation pool, sludge pond, open pit ore mining, Erzberg mountain at Eisenerz, Styria, Austria, Europe

Liberty Cap, extinct travertine cone geyser, Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Sinter terraces, detailed view of the structure, Wai-O-Tapu Thermal Wonderland, Rotorua, North Island, New Zealand

Versturzhoehle Riesenburg, natural karst cave ruin of Frankendolomite, geotope, natural monument, near Engelhardsberg, district of Markt Wiesenttal, Upper Franconia, Franconian Switzerland, Franconia, Bavaria, Germany, Europe

Rainbow and Cascade Terrace, Orakei Korako Cave and Thermal Park, Taupo-Rotorua, North Island, New Zealand

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

Steaming hot spring with colored mineral deposits, Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA, North America

Dead camel thorns (Acacia erioloba) in front of sand dunes, Dead Vlei, Sossusvlei, Namib Desert, Namib-Naukluft National Park, Namibia, Africa

Dried clay soil in Deadvlei, Sossusvlei, Namib Desert, Namib-Naukluft National Park, Namibia, Africa