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Krill swarm cooked pink by fumarole activity on the volcanic island of Deception Island, Antarctica, Polar Regions

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 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

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

Mineral stained pond on collapsed flank of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

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

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

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

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

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

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

People walking through fumaroles on Volcano Gran crater rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Gran Cratere (The Great Crater) and Aeolian Islands view, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. A crater wall separates Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

February 11, 2008 - Dallol geothermal area, egg-shaped fumarole deposits formed in salt deposits of brine hot springs, Danakil Depression, Ethiopia.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Kofah (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

Sulphur and other minerals at an active fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Sulphur and other minerals at an active fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Large carved face at Bukit Kasih, a volcanic tourist park with fumarole fields, a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Hindu Temple at this tourist park with a peace tower, worship houses of five major religions and volcanic fumaroles, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumaroles, sulphur and volcanic strata in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Boiling water at a steaming fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Large carved face at Bukit Kasih, a volcanic tourist park with fumarole fields, a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming volcanic fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Pavilion at this volcanic tourist park with a peace tower, worship houses of five religions and steamy fumaroles, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole field at Bukit Kasih, a tourist volcanic park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole field at Bukit Kasih, a tourist volcanic park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumaroles by Lake Linow, a popular volcanic attraction and geothermal centre south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Sulphur and fumarole smoke on volcano Gran crater, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Damage to pillars caused by fumarole steam and sulphur minerals at Bukit Kasih volcanic tourist world peacepark, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe

Sulphur and fumaroles smoke on volcano Gran Cratere, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Gran Cratere (The Large Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Steaming fumaroles, sulphur and volcanic strata in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole with sulphur deposits in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Large carved face at Bukit Kasih, a volcanic tourist park with fumarole fields, a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Panoramic of sunset over the fumarole of Erta Ale volcano, Danakil Depression, Afar Region, Ethiopia, Africa

Sulphurous fumaroles and volcanic strata in Tompaluan active crater on the flank of Mount Lokon, a volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia Indonesia

The world peace themed tower and dark stormy sky at this tourist park with worship houses of five major religions and volcanic fumarole field,. Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Geothermal Reykjanes power plant and smoking fumarole at Gunnuhver hot spring, Reykjanes Peninsula, Iceland

Steaming volcanic fumarole field, shops and cafes at Bukit Kasih, a tourist park with a peace tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe

Sulphur and fumarole smoke on volcano Gran crater, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

The world peace themed tower at this tourist park with worship houses of five major religions and volcanic fumarole fields, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming volcanic fumarole field at Bukit Kasih, a tourist park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

Fumaroles on the crater edge, island of Vulcano, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Steam issuing from sulphurous fumarole at Gran Craters, Vulcano Island, with islands of Lipari and Salina beyond, Aeolian Islands (Eolian Islands) (Lipari Islands), UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Tourists by green crater lake and fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Guides dipping twigs in molten sulphur at fumaroles in Papandayan Volcano, Garut, W Java, Java, Indonesia, Southeast Asia, Asia

Steam fumaroles in geothermal field, Sol de Manana, near Laguna Colorado, Southwest Highlands, Bolivia, South America

Steaming fumaroles (volcanic vents) at Hverir (Hverarond), east of Myvatn in the central area, Iceland, Polar Regions

Steaming fumaroles (volcanic vents) at Hverir (Hverarond), east of Myvatn in the central area, Iceland, Polar Regions

A fresh lava flow that erupted during the Krafla fires at Leirhnjukur near Myvatn, during the 1970s and 80s, Iceland, Polar Regions

A fresh lava flow that erupted during the Krafla fires at Leirhnjukur near Myvatn, during the 1970s and 80s, Iceland, Polar Regions

A fresh lava flow that erupted during the Krafla fires at Leirhnjukur near Myvatn, during the 1970s and 80s, Iceland, Polar Regions

A fresh lava flow that erupted during the Krafla fires at Leirhnjukur near Myvatn, during the 1970s and 80s, Iceland, Polar Regions

A fresh lava flow that erupted during the Krafla fires at Leirhnjukur near Myvatn, during the 1970s and 80s, Iceland, Polar Regions

Fumaroles emitting steam in the geothermal area of Hverir near Myvatn, northern Iceland, Polar Regions

Fumaroles emitting steam in the geothermal area of Hverir near Myvatn, northern Iceland, Polar Regions