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One of three crater lakes at the summit of Kelimutu volcano near Moni, soil chemical creates the unusual colours, island of Flores, Indonesia, Southeast Asia, Asia

View east along crater rim from Orongo ceremonial village of the Rano Kau crater, Easter Island, Chile, Pacific, South America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

Versuvius Volcano seen from Pompeii, buried in AD79 eruption, Renovated stonework of a building on the edge of the Roman Forum, Pompeii, UNESCO World Heritage Site, Campania, Italy, Europe

The geothermal Krafla Power Station, largest geothermal power station in Iceland, located near the Krafla Volcano, Iceland, Polar Regions

The geothermal Krafla Power Station, largest geothermal power station in Iceland, located near the Krafla Volcano, Iceland, Polar Regions

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Skylight, view through cooled lava to molten lava below, with plumes of steam as lava reaches the sea beyond, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island', Hawaii, United States of America, North America

Mount Mayon, 2462 m, near-perfect volcano cone with plume of smoke reflected in rice field, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia

Mount Mayon, 2462 m, near-perfect volcano cone with plume of smoke, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia

Waterfall beneath Mount Mayon, 2462m, a volcanic cone with plume of smoke, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, Big Island, Hawaii, Hawaiian Islands, United States of America, North America

Oldonyo Lengai volcano, 2878m, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Eruption of Gunung Merapi, a highly active volcano near Yogyakarta, Java, Indonesia, Southeast Asia, Asia

Public bus in front of the Avachinskaya Sopka volcano near Petropavlovsk-Kamchatsky, Kamchatka, Russia, Eurasia

Tourist walks round Masaya crater, Santiago crater, Park National Volcan Masaya, Masaya, Nicaragua, Central America

Turquoise waters and volcano, Isla de los Lobos, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

St. Pierre Bay, with Mont Pelee behind, scene of 1902 volcanic disaster, which killed 30,000 people, Martinique, Windward Islands, West Indies, Caribbean, Central America

Lake Atitlan from Lomas de Tzununa Hotel with San Pedro Volcano in the background, Guatemala, Central America

Tour boat near Panajachel, San Pedro Volcano in the background, Lake Atitlan, Guatemala, Central America

Mount Krakatindur, 858 m, standing solitary in the Nyjahraun lava field, east of Hekla volcano in the distance, Fjallabak route north (Nyrdri-Fjallaback) in the interior, Iceland, Polar Regions

Dromedary ride on slopes of Timanfaya mountain, Timanfaya National Park, Lanzarote, Canary Islands, Spain, Europe

Sulphur carriers climbing out of Kawah Ijen volcano (Ijen crater), Banyuwangi, East Java, Indonesia, Southeast Asia, Asia

Sulphur carriers climbing out of Kawah Ijen volcano (Ijen crater), Banyuwangi, East Java, Indonesia, Southeast Asia, Asia

Man boiling Megapode eggs in a sulphur stream of Volcano Tavurvur, Rabaul, East New Britain, Papua New Guinea, Pacific

Horsemen and horses on the banks of Mount Bromo volcano, Eastern Java, Indonesia, Southeast Asia, Asia

The main square of Granada with view to the Mombacho Volcano in the background, Granada, Nicaragua, Central America

Volcano House, Cesar Manrique Foundation, Tahiche, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Steam plumes from hot lava flowing onto beach and into the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

Rincon Volcano from the Hacienda Guachipelin, near Rincon de la Vieja National Park, Guanacaste, Costa Rica, Central America

Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

Mount Ngauruhoe, 2287m, and Red Crater on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific

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

Agricultural land at the foot of the mighty volcano Hekla, north of Hella, in the south of Iceland (Sudurland), Iceland, Polar Regions

View across the rim of the dormant San Fernando crater of the Volcan Masaya in the Volcan Masay National Park, Nicaragua, Central America

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

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Third crater from the summit of Irazu, highest in Costa Rica at 3432m, last erupted 1994, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America

Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

Miner on the crater rim of 2400m volcano of Gunung Ijen in east Java, Indonesia, Southeast Asia, Asia

Volcano House, Cesar Manrique Foundation, Tahiche, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Late winter hikers on Tongariro crossing, Mount Ngauruhoe and South Crater, Taupo, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Hikers on Dome Ridge near the summit of 2797m Mount Ruapehu, highest and most active of the volcanoes in the National Park, Tongariro National Park, UNESCO World Heritage Site, central plateau, North Island, New Zealand, Pacific

Gros Piton, UNESCO World Heritage Site, and reflection in the swimming pool at Sugar Beach, St. Lucia, Windward Islands, West Indies, Caribbean, Central America

Part of the vast crater of 10023 ft Haleakala, the world's largest dormant volcano, seen from Sliding Sands trail, Maui, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Worker carrying big pieces of sulphur out of the Ijen Volcano, Java, Indonesia, Southeast Asia, Asia

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Irregular blocky lava (a'a) and cinder cones of the volcanic landscape of Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Looking across the old crater towards the smoking 2438m summit of the active volcano Mount Canison, Visayan island of Negros, Philippines, Southeast Asia, Asia

Cacti, Stromboli Island, Eolian Islands (Aeolian Islands), UNESCO World Heritage Site, Italy, Mediterranean, Europe

Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America