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Morning Glory Pool, a geothermal pool, colours are due to algae at temperature bands, hotter below, Yellowstone National Park, Wyoming, USA
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
An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific
Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific
Woman enjoying the hot waters of the Kurokawa onsen, public spa, Kyushu, Japan, Asia
Woman enjoying the hot waters of the Kurokawa onsen, public spa, Kyushu, Japan, Asia
Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America
Hot bubbling mud pool at Orakei Korako Thermal Park, The Hidden Valley, North Island, New Zealand, Pacific
The Sol de Manana geysers, a geothermal field at a height of 5000 metres, Bolivia, South America
Devil's Bath, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Geothermal fields at Krysuvik, Reykjanes Peninsula, Iceland, Polar Regions
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
Old Faithful geyser blowing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Champagne Pool, Waiotapu, Rotorua, 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
Tourists watching Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Geothermal activity of mudpots, geysers, and hot springs, at Geysir, Haukadalur valley, Golden Circle, Iceland, Polar Regions
Kurokawa onsen, public spa, Kyushu, Japan, Asia
Bubbling mud pool at Te Puia Springs, Rotorua, North Island, New Zealand, Pacific
Devil's Bath, Waiotapu Thermal Area, 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
Mudpots at Namaskard geothermal area (Namafjall-Hverarond), near Lake Myvatn and Reykjahlid, North Iceland, Iceland, Polar Regions
Bubbling mud, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Woman enjoying the hot waters of the Kurokawa onsen, public spa, Kyushu, Japan, Asia
Steaming geothermal area at Orakei Korako Thermal Park, The Hidden Valley, North Island, New Zealand, Pacific
Lady Knox Geyser, Wai-O-Tapu Thermal Wonderland, North Island, New Zealand, Pacific
Geothermal fields at Krysuvik, Reykjanes Peninsula, Iceland, Polar Regions
Steam vent at Namaskard geothermal area (Namafjall-Hverarond), Mount Burfell, 935m, behind, near Lake Myvatn and Reykjahlid, North Iceland, Iceland, Polar Regions
The Sol de Manana geysers, a geothermal field at a height of 5000 metres, Bolivia, South America
Bubbling mud, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Morning Glory Pool in Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Pohutu Geyser and Prince of Wales Geyser, Rotorua, North Island, New Zealand, Pacific
Pohutu Geyser, Rotorua, North Island, New Zealand, Pacific
Pohutu Geyser and Prince of Wales Geyser, Rotorua, North Island, New Zealand, Pacific
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
Whakarewarewa Thermal Reserve, North Island, New Zealand, Pacific
Tourists watching Strokkur Geyser erupt, Geysir, The Golden Circle, Iceland, Polar Regions
Pohutu Geyser and Prince of Wales Geyser, Rotorua, North Island, New Zealand, Pacific
Devil's Bath, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
The Lady Knox Geyser, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Svartsengi (Blue Lagoon) Geothermal Power Station at sunset, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions
Mudpots at Namaskard geothermal area (Namafjall-Hverarond), near Lake Myvatn and Reykjahlid, North Iceland, Iceland, Polar Regions
Hot pool in the Kurokawa onsen, public spa, Kyushu, Japan, Asia
Champagne Pool, Waiotapu, Rotorua, North Island, New Zealand, Pacific
Bubbling mud, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Excelsior Geyser Crater, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
A geothermal hotspring pool with dissolved minerals, Geysir, Golden Circle, Iceland, Polar Regions
Strokkur Geysir erupting at sunrise during winter, geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions
Champagne pool, Waiotapu, Rotorua, North Island, New Zealand, Pacific
Hot pools and steam from Strokkur Geysir at sunrise, winter, at geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions
Pohutu Geyser and Prince of Wales Geyser, Rotorua, North Island, New Zealand, Pacific
Pohutu Geyser and Prince of Wales Geyser, Rotorua, North Island, New Zealand, Pacific
Strokkur Geysir erupting against stormy sky, Geysir, South West Iceland, Polar Regions
Svartsengi (Blue Lagoon) Geothermal Power Station at sunset, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions
Pohutu Geyser and Prince of Wales Geyser, Rotorua, North Island, New Zealand, Pacific
Lady Knox Geyser, Wai-O-Tapu Thermal Wonderland, North Island, New Zealand, Pacific
Geothermal activity of mudpots, hot springs and fumaroles, at Krisuvik (Krysuvik-Seltun), Reykjanes Peninsula, south-west Iceland, Iceland, Polar Regions
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Boiling mudpools in geothermal area on Reykjanes Peninsula, near Keflavik, Iceland, Polar Regions
Tourist at El Tatio Geysers (Geysers del Tatio), the largest geyser field in the Southern Hemisphere, Atacama Desert, Chile, South America
Hot pools and steam from Strokkur Geysir at sunrise, winter, at geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions
Tourists watching geothermal activity of mudpots, hot springs and fumaroles, at Krisuvik (Krysuvik-Seltun), Reykjanes Peninsula, south-west Iceland, Iceland, Polar Regions
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Waiotapu thermal area, Rotorua, North Island, New Zealand, Pacific
Pohutu Geyser, Te Puia, Rotorua, North Island, New Zealand, Pacific
Rainbow Geyser, Rotorua, North Island, New Zealand, Pacific
Lake Ngakoro Waterfall, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Oyster Pool, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Strokkur Geysir erupting at sunrise during winter, 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
Blue holes and white crystals, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Waiotapu thermal area, Rotorua, North Island, New Zealand, Pacific
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Geothermal hot spring, Reykjahlid, Iceland, Polar Regions
Champagne Pool, in Waiotapu geothermal area, Rotorua, North Island, New Zealand, Pacific
Riverside Geyser, Upper Geyser Basin Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Strokkur Geysir erupting against stormy sky, Geysir, South West Iceland, Polar Regions
Strokkur Geyser, Geysir, The Golden Circle, Iceland, Polar Regions
Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Strokkur Geysir erupting at sunrise on a freezing winter's morning against the colourful sky, Geysir, Haukardalur Valley, Iceland, Polar Regions
Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia
Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia
A view of the boiling mud at Namafjall, Iceland
A view of the boiling mud at Namafjall, Iceland
Geysers El Tatio, Antofagasta Region, Chile, South America
Fumarolas da Lagoa das Furnas, hot springs, Sao Miguel Island, Azores, Portugal, Atlantic, Europe
Fumaroles of Furnas Lake, Island of Sao Miguel, Azores, Portugal, Atlantic, Europe
Mineral deposits from geothermal steam vents at Te Puia, Gisborne District, North Island, New Zealand, Pacific
A turquoise pool next to the Te Puia geysers, Gisborne District, North Island, New Zealand, Pacific
Leirhnjukur thermal area and eruption site near Krafla geothermal power station, Lake Myvatn, North area, Iceland, Polar Regions
Geysers El Tatio, Antofagasta Region, Chile, South America
Geyser and steam vents at Te Puia, Gisborne District, North Island, New Zealand, Pacific
Champagne Pool in the Waiotapu geothermal area in the North Island, New Zealand, Pacific
Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America