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View of active volcano from helicopter, Big Island, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Sulphur crystals on fumarole at Papandayan Volcano an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

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

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

Green crater lake and steaming fumaroles at Papandayan Volcano, an active four cratered caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Southern elephant seal (Mirounga leonina) bull uses vocalisation and produces steam, Sea Lion Island, Falkland Islands, South America

Fallen lodgepole pines, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Smoking 700m wide crater of Volcan Telica in the North West volcano chain, one of the country's most active volcanoes, Leon, Nicaragua, Central America

People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Summit of active Volcan San Cristobal, 1745m, in the North West volcano chain, the country's highest volcano, Chinandega, Nicaragua, Central America

Steam rising off hot geothermal pipes at dawn, Wairakei Steam Field, Taupo, North Island, New Zealand, Pacific

Pool runoff of orange bacteria and algae (Therophiles), Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

The great geyser Geysir, now dormant (2008), with the more active Strokkur geyser erupting in the distance, Geysir, Haukadalur valley, Golden Circle, Iceland, Polar Regions

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

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

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

Hot pool on the Rainbow Terrace at Orakei Korako Geyserland, The Hidden Valley, 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

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

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

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

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

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

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

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

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

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

Artist's Palette and Rainbow Terrace at Orakei Korako Thermal Park, The Hidden Valley, North Island, New Zealand, Pacific

Mud Volcano Area, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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

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

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

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

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

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

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

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Geysers in Yellowstone Park, West Yellowstone, Montana, United States of America (U.S.A.), North America

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