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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

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

Local woman in colourful traditional dress cooks breakfast over an open fire, Chumbe Community, Lamay, Sacred Valley, Peru, South America

Chillies for sale, Kad Luang fish and vegetable market in Chiang Mai, Thailand, Southeast Asia, Asia

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, 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

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

Two Berber men walking in the sand dunes of Erg Chebbi Desert, Sahara Desert near Merzouga, Morocco, North Africa, Africa

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

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

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

Mud Volcano Area, 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

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

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

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

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

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