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Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Devil's Thumb, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North  America

Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Ephemeral Spring on Red Wall of Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Wooden boardwalk over the mineral sinter formations on Geyser Hill, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Solfataras, fumaroles, mud pools, sulfur and other minerals, steam, Hveraroend geothermal area, N√°mafjall mountains, M√Ωvatn area, Nor√∞urland eystra, the north-east region, Iceland, Europe

Solfataras, fumaroles, mud pools, sulfur and other minerals, steam, Hveraroend geothermal area, N√°mafjall mountains, M√Ωvatn area, Nor√∞urland eystra, the north-east region, Iceland, Europe

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

Eroded hoodoos and rock formations in the Coal Mine Canyon, coloured by minerals, Coal Mine Mesa, Painted Desert, Hopi Reservation, Navajo Nation Reservation, Arizona, USA

Eroded hoodoos and rock formations in the Coal Mine Canyon, coloured by minerals, Coal Mine Mesa, Painted Desert, Hopi Reservation, Navajo Nation Reservation, Arizona, USA

Eroded hoodoos and rock formations in the Coal Mine Canyon, coloured by minerals, Coal Mine Mesa, Painted Desert, Hopi Reservation, Navajo Nation Reservation, Arizona, USA

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

Acidic pools, mineral formations, salt deposits in the crater of Dallol Volcano, Danakil Depression, Afar Region, Ethiopia