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Walkway, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Food being cooked on volcanic grill at visitor centre, Parque Nacional de Timanfaya, national park, Lanzarote, Canary Islands, Atlantic, Europe

Visitors, steam and vivid colours, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sulphur encrusted fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Part of the Estrada de Ferro Oeste de Minas (West Minas Railway), created in 1878, the 13km line from Tiradentes to Sao Joao Del Rei is the oldest working line in Brazil, Tiradentes, Minas Gerais, Brazil, South America

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

Fumaroles on collapsed side of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Pohutu geyser erupting steaming water from sulphurous mud and rock in Te Puia, Whakarewarewa Thermal Reserve in geothermal valley, Rotorua, North Island, New Zealand, Pacific

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

Lone Star Geyser erupts and creates rainbow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hot pool on the Rainbow Terrace at Orakei Korako Geyserland, The Hidden Valley, North Island, New Zealand, Pacific

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

Woman looking at a Geysirfield in the Te Puia Maori Cultural Center, Rotorura, North Island, New Zealand, Pacific

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

Active Gunung Bromo volcano at night, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

Hverarondor Hverir mud pots, steam vents, and sulphur deposits on the north coast of Iceland, Polar Regions

Hverarondor Hverir mud pots, steam vents, and sulphur deposits on the north coast of Iceland, Polar Regions

The Champagne pool, Wai-o-tapu Thermal Wonderland, geothermal area, Waiotapu, Rotorua, North Island, New Zealand, Pacific

Geothermal steam, frosted trees and snow-free hot ground in Norris Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Tourists gather to watch Strokker geyser (geysir), an erupting spring at Haukadalur, Iceland, Polar Regions

Fumaroles (steam vents) in Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Panorama of sulphur worker appearing out of toxic fumes at Kawah Ijen volcano, East Java, Indonesia, Southeast Asia, Asia

Worker loaded with big pieces of sulphur in front of steam clouds on the Ijen crater lake, Java, Indonesia, Southeast Asia, Asia

Freezing mists, dawn, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mudpots at Namaskard geothermal area (Namafjall-Hverarond), near Lake Myvatn and Reykjahlid, North Iceland, Iceland, Polar Regions

Tourists exploring White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Steam vent at Namaskard geothermal area (Namafjall-Hverarond), Mount Burfell, 935m, behind, near Lake Myvatn and Reykjahlid, North Iceland, Iceland, Polar Regions

Steam fumaroles in Jigokudani geothermal area, Noboribetsu Onsen, Shikotsu-Toya National Park, Hokkaido, Japan

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

La Trochita, the Old Patagonian Express between Esquel and El Maiten in Chubut Province, Patagonia, Argentina, South America

Old Dinah, a 1894 steam tractor in Furnace Creek, Death Valley National Park, California, United States of America, North America

Geologists taking mineral samples on Gran Cratere (The Great Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

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

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Toxic sulphur fumes escaping from the ceramic pipes at Kawah Ijen, Java, Indonesia, Southeast Asia, Asia

Rainbow cast by eruption of Riverside Geyser, Firehole River, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists watching geyser erupting, Strokkur (the Churn) erupts every 5-10 minutes to heights of up to 20 meters (70ft), Geysir, Golden Circle, Iceland, Polar Regions

Geothermal activity of mudpots, geysers, and hot springs, at Geysir, Haukadalur valley, Golden Circle, Iceland, Polar Regions

Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Plume of water and steam from the Strokkur Geysir exploding into the air at Geysir near Reykjavik, Iceland, Polar Regions

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

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Hverir geothermal fields at the foot of Namafjall mountain, Myvatn Lake area, Iceland, Polar Regions

Rusting old steam locomotive at the Train cemetery (train graveyard), Uyuni, Southwest, Bolivia, South America

Rusting old steam locomotives at the Train cemetery (train graveyard), Uyuni, Southwest, Bolivia, South America

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

Sawmill Geyser erupts, 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

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific