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Aerial view, Volcano in Parque Natural de los Volcanes, Timanfaya, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Aerial view of smoke above the turquoise lake on crater of Kawah Ijen volcano, Banyuwangi, East Java, Indonesia

Looking down into Ubehebe crater, a Maar volcano, caused by groundwater contacting hot magma or lava, Death Valley National Park, California, United States of America, North America

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

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

Khorgo volcano crater and White Lake in the background, Tariat district, North Hangay province, Mongolia, Central Asia, Asia

Panorama of the western Bonito Lava Field at Sunset Crater Volcano, Arizona, United States of America, North America

Aerial view of Ngorongoro Crater in the Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Aerial view of Ngorongoro Crater in the Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

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

Tourists on Volcan Poas, the Active Crater of 2704m set in it's own National Park, Alajuela Province, Costa Rica

January 22, 2012 - Glowing lava in crater illuminating gas cloud above Nyamuragira Volcano, Kimanura Eruption.

Japanese warning sign on the Crater rim of Mount Naka, an active volcano, Mount Aso, Kyushu, Japan, Asia

Small crater of Formica Leo volcano in caldera Enclos Fouque near Piton de la Fournaise volcano, viewed from Pas de Bellecombe.Reunion island,overseas departement of France,Indian Ocean

January 22, 2012 - Bush silhouetted against glow of lava in crater of Nyamuragira Volcano, Kimanura Eruption.

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.

May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

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.

Dead trees from a past forest fire on the slope of O'Leary Peak in northern Arizona. Sunset Crater Volcano is in the background.

View along the slope and hiking trail up towards the Red Crater Volcano, on Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Close up of turquoise, vibrant Emerald Lake with steaming volcano, Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Shore of the Emerald Lake, natural vibrant colour gradient with view on the Red Crater Volcano of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

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 24, 2012 - Lava in crater glowing during blue hour on Nyamuragira Volcano, Kimanura Eruption.

November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.

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.

People looking at view of Stromboli island from Gran crater rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, 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

View of Sunset Crater Volcano from the east slope of the Lenox Crater Trail, the dark gray soil is volcanic pumice, Arizona, United States of America, North America

People walking on the edge of the crater of Mount Vesuvius, Province of Naples, Campania region, Italy, Europe

Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

View along the slope and hiking trail up towards the Red Crater Volcano, on Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

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.

November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.

May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

Gran Cratere and Aeolian Islands view, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Burned out tree on the left with Sunset Crater Volcano in the background, near Flagstaff, Arizona, United States of America, North America

The peak of Mount Lokon, a stratovolcano with Tompaluan active crater on its flank, near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Mount Mahawu, a stratovolcano and active 180m wide crater, with Lokon on the left, and Empung volcanoes beyond, Gunung Mahawu, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Japanese warning sign on the Crater rim of Mount Naka, an active volcano, Mount Aso, Kyushu, Japan, Asia

Sunrise at the volcano slopes Red Crater, Tongariror Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Red Crater and Mount Ngauruhoe in Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Emerald lake on volcano slope, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Close up of turquoise, vibrant Emerald Lake with steaming volcano on Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Shore of the Emerald Lake, natural vibrant colour gradient with view on the Red Crater Volcano of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Turquoise and yellow green Emerald Lake in front of the Tongariro Volcano, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

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

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

View from the Lower Lava Trail near Sunset Crater Volcano, north of Flagtaff, Arizona, United States of America, North America

Sulphur at the Stefanos Volcano Crater, detailed view, Nisyros Island, Dodecanese, Greek Islands, Greece, Europe

Mount Mahawu, a stratovolcano and active 180m wide crater, with Lokon on the left, and Empung volcanoes beyond, Gunung Mahawu, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Wide angle view of an Emerald Lake in front of Red Crater Volcano in the Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific