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Hot pools and steam from Strokkur Geysir at sunrise, winter, at geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions

Blue holes and white crystals, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Crested Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Excelsior Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sandstone pinnacles, Chesler Park, The Needles district, Canyonlands National Park, Utah, United States of America, North America

Tourists in hot springs of Termas de Polques on the Altiplano, Potosi Department, Bolivia, South America

Water turning to steam by subterranean heat, Islote de Hilario, Timanfaya National Park, Lanzarote, Canary Islands, Spain

Strokkur Geysir erupting at sunrise during winter, geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions

Tourists on boardwalk over the mineral runoff from Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sapphire Pool, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Svartsengi (Blue Lagoon) Geothermal Power Station at sunset, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

White Island (Whakaari) active marine volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Visitors at Cistern Spring, Norris Geyser Basin, Yellowstone UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourist at El Tatio Geysers (Geysers del Tatio), the largest geyser field in the Southern Hemisphere, Atacama Desert, Chile, South America

Geothermal activity of mudpots, hot springs and fumaroles, at Krisuvik (Krysuvik-Seltun), Reykjanes Peninsula, south-west Iceland, Iceland, Polar Regions

Hot stream detail at Orakei Korako Thermal Park, The Hidden Valley, North Island, New Zealand, Pacific

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Pinwheel Geyser, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Ephedra spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists in hot springs of Termas de Polques on the Altiplano, Potosi Department, Bolivia, South America

The crater with active lava lake of Mount Nyiragongo, Virunga National Park, UNESCO World Heritage Site, Democratic Republic of the Congo, Africa

A woman fans the open fire as she makes coffee in a traditional Ethiopian coffee pot, Ethiopia, Africa

Blue Funnel spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists looking at Seismograph and Bluebell pools, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Blue holes and white crystals, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists watching geothermal activity of mudpots, hot springs and fumaroles, at Krisuvik (Krysuvik-Seltun), Reykjanes Peninsula, south-west Iceland, Iceland, Polar Regions

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

Old Faithful Geyser erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America