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Mount St. Helens, with steam plume from rising dome within crater, seen from Johnston Ridge Visitor Centre, Washington state, United States of America, North America
Aerial view of La Reunion, Indian Ocean, Africa
One of the Emerald Lakes, explosion craters filled with mineral-tinted water, on Mount Tongariro in the Tongariro National Park on the central plateau, North Island, New Zealand
Birdman petroglyphs at Orongo ceremonial village on rim of crater Rano Kau, offshore lie bird islands of Motu Kao Kao, Motu Iri and Motu Nui, Easter Island, Chile, Pacific
Aerial of the volcanic crater with Lake Mazafim, island of Annobon, Equatorial Guinea, Africa
Road across a volcanic crater, with small buildings in the distance, inland on the island of Sao Vicente, Republic of Cape Verde Islands, Atlantic, Africa
Volcanoes in Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Aerial view, Volcano in Parque Natural de los Volcanes, Timanfaya, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Snow covered frozen Viti (Hell) crater near Krafla power plant, Lake Myvatn, North area, Iceland, Polar Regions
A view of the volcanic crater of Cova de Paul on Santo Antao Island, Cape Verde, Africa
Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Tourists on the boardwalk around the Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Lone Pine Tree, Coconino National Forest, Arizona, USA
Volcanic cones on top of Mauna Kea, Big Island, Hawaii, United States of America, Pacific
Lava erupting from cinder cone, Eyjafjallajokull volcano, Iceland, Polar Regions
Fountaining lava from Eyjafjallajokull volcano, Iceland, Polar Regions
Lava erupting from Eyjafjallajokull volcano, Iceland, Polar Regions
Volcanic cinder hill in Coconino National Forest, Arizona, USA
Looking into the cinder cone of erupting Eyjafjallajokull volcano, Iceland, Polar Regions
Lava flowing down mountain, Eyjafjallajokull volcano, Iceland, Polar Regions
Aerial view of Vesuvius crater and Gulf of Naples at sunrise, Naples, Campania, Italy, Europe
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
Eldborg volcanic crater, declared a Protected Natural Monument in 1974, Iceland, Polar Regions
Small crater of Formica Leo volcano in caldera Enclos Fouque near Piton de la Fournaise, Reunion
Piton de la Fournaise volcano, Reunion
Volcanic cinder hills in Coconino National Forest, Arizona, USA
Humphrey's Peak, Coconino National Forest, Arizona, USA
Mount Vesuvius volcano crater and red rock landscape, near Naples, Campania, Italy, Europe
Aerial panoramic of Vesuvius volcano at sunrise, Naples, Campania, Italy, Europe
Aerial view of smoke above the turquoise lake on crater of Kawah Ijen volcano, Banyuwangi, East Java, Indonesia
Aerial view of Vesuvius crater and Sorrento peninsula at sunrise, Naples, Campania, Italy, Europe
The boundary fence between Coconino National Forest and Sunset Crater National Monument of Arizona, USA
The boundary fence between Coconino National Forest and Sunset Crater National Monument of Arizona.
February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible.
February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible. Static lightning discharges are visible at top of picture.
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.
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.
January 24, 2012 - Lava in crater glowing during blue hour on Nyamuragira Volcano, Kimanura Eruption.
January 22, 2012 - Glowing lava in crater illuminating gas cloud above Nyamuragira Volcano, Kimanura Eruption.
January 22, 2012 - Bush silhouetted against glow of lava in crater of Nyamuragira Volcano, Kimanura Eruption.
November 2007 - Aerial view of crater lake in Tongariro volcanic complex, New Zealand.
November 2007 - Snow-covered Ngauruhoe cone, Mount Tongariro volcano, New Zealand.
November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.
November 2007 - Aerial view of White Island (Whakaari) volcano with central acidic crater lake, Bay of Plenty, New Zealand.
January 21, 2011 - Active lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.
May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.
February 11, 2008 - Dallol geothermal area, 1926 explosion crater by Black Mountain, Danakil Depression, Ethiopia.
February 10, 2008 - Dallol geothermal area, brine hot springs, Danakil Depression, Ethiopia.
January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.
January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, terraces of potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
Quilotoa Lake, Cotopaxi Province, Ecuador
O'Leary Peak, Coconino National Forest, Arizona, USA
Volcanic cinder hills in Coconino National Forest, Arizona, USA
Volcanic cinder hills in Coconino National Forest, Arizona, USA
Volcanic cinder hills in Coconino National Forest, Arizona, USA
Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia
Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia
Sunset Crater Volcano viewed from the forested slope of O'Leary Peak in northern Arizona.
Poas volcano, Poas National Park, Costa Rica, Central America
Poas volcano, Poas National Park, Costa Rica, Central America
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Smoke over the two craters of Erta Ale volcano summit caldera, Danakil Depression, Afar Region, Ethiopia, Africa
Panoramic aerial view of sunset over the active Erta Ale volcano crater, Danakil Depression, Afar Region, Ethiopia, Africa
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica
A view of the boiling mud at Namafjall, Iceland
View from Calderon Honda crater of lava rock ruins and volcanic cones of the north, Lajares, Fuerteventura, Canary Islands, Spain, Europe
View from Calderon Honda crater of lava rock ruins and volcanic cones of the north, Lajares, Fuerteventura, Canary Islands, Spain, Europe
Late afternoon light on the Crater Lake of the Crater Lake National Park, Oregon, United States of America, North America
Volcanic landscape of the Masaya caldera, Nicaragua's first national park, with craters and a'a blocky lava, Masaya, Nicaragua, Central America
Crater of the Poas volcano, San Jose, Costa Rica, Central America
Gran Cratere and Aeolian Islands view, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
People looking at view of Stromboli island from Gran crater rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe
Sulphur and fumaroles smoke on volcano Gran Cratere, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
Sulphur and fumarole smoke on volcano Gran crater, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
Geologists taking minerals samples on Gran Cratere (The Great Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
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
Hverfell Crater rising out of the Dimmuborgir Lava Field, Myvatn Region, Iceland, Polar Regions