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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
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
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 in a volcanic valley in Coconino National Forest near Sunset Crater National Monument of Arizona.
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 rim in Coconino National Forest near Sunset Crater National Monument of Arizona. Humphrey's Peak is in the background.
Looking into the cinder cone of erupting Eyjafjallajokull volcano, Iceland, Polar Regions
Lava flowing down mountain, Eyjafjallajokull volcano, Iceland, Polar Regions
Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona. Humphrey's Peak is in the background.
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
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Humphrey's Peak viewed from a volcanic ridge in Coconino National Forest near Sunset Crater National Monument of Arizona.
Aerial panoramic of Vesuvius volcano at sunrise, Naples, Campania, Italy, Europe
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
A burned tree below a volcanic cinder hill in the Coconino National Forest near Sunset Crater National Monument Arizona.
An SUV traveling near Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Lone Pine Tree in a volcanic valley in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hill in Coconino National Forest near Sunset Crater National Monument of Arizona with snow capped Humphrey's Peak in the background.
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.
January 27, 2011 - Dallol geothermal area, 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.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
The southeast summit of O'Leary Peak viewed from a volcanic cinder hill in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.
Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona. Humphrey's Peak is in the background.
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.
O'Leary Peak viewed from a Volcanic cinder rim slope in Coconino National Forest near Sunset Crater National Monument of Arizona.
Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona.
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
Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona.
Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona. Humphrey's Peak is in the background.
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
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
Lava lake in the caldera of the Ambrym volcano, Vanuatu, Pacific
Smoking Ambrym volcano, Vanuatu, Pacific
Smoking Ambrym volcano, Vanuatu, Pacific
Smoking Ambrym volcano, Vanuatu, Pacific
Exploring a volcanic landscape on a footpath up Saxholl cinder cone and crater, Snaefellsjokull National Park, western Iceland, Polar Regions
Majestic crater of Hondo volcano (Calderon Hondo) with the ocean in background, Corralejo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Panoramic view, crater of Blue Lake and Tongariro Volcano at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
A view of the volcanic crater of Cova de Paul on Santo Antao Island, Cape Verde, Africa
Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona.
The southeast summit of O'Leary Peak viewed from a volcanic ridge in Coconino National Forest near Sunset Crater National Monument of Arizona.
Aerial view of Vesuvius crater and Sorrento peninsula at sunrise, Naples, Campania, Italy, Europe
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. 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 22, 2012 - Bush silhouetted against glow of lava in crater of Nyamuragira Volcano, Kimanura Eruption.
November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.
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.
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
A view of the boiling mud at Namafjall, Iceland
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
Volcanic cinder hill in Coconino National Forest near Sunset Crater National Monument of Arizona with a pine tree backlit by the sun.
Volcanic cinder hills in Coconino National Forest near 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.
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.
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.
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.
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.