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Morning Glory Pool in Upper 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

Lava flowing from Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, The Big Island, Hawaii, United States of America, North America

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

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

Rock formations, Chesler Park, The Needles district, Canyonlands National Park, Utah, United States of America, North America

Dried mud pan with ancient camelthorn trees and orange sand dunes in the distance, Dead Vlei, Namib Desert, Namib Naukluft Park, Namibia, Africa

The site of the Commandants House showing supports for suspended floor system with hot air to heat rooms above, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

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

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

Distant view towards mountains with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

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

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

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

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

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

Steaming volcanic mud pools, Rincon de la Vieja National Park at foot of Rincon Volcano, Gaunacaste, Costa Rica

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