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Steam plume from active vent beside crater lake, Volcan Poas, Cordillera Central, Costa Rica, Central America

View of active volcano from helicopter, Big Island, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

View from Mount Ruapehu of Mount Ngauruhoe with a ski cottage in the foreground, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Woman on Mount Ruapehu looking towards Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Aerial of a tuquoise crater lake on top of Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Aerial of Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Ski cottage on Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Ski cottage on Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Hill town with backdrop of snowy volcano Mount Etna, Gangi, Palermo Province, Sicily, Italy, Mediterranean, Europe

Hill town with backdrop of snowy volcano Mount Etna, Gangi, Palermo Province, Sicily, Italy, Mediterranean, Europe

Hikers from the cablecar near the smoking summit of 3350m volcano Mount Etna during an active phase, Mount Etna, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Ash, rock and sulphur at the smoking summit of 3350m high volcano Mount Etna during an active phase, Mount Etna, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Looking from Taormina towards Trupiano and the smoking 3350m high volcano of Mount Etna during an active phase, Trupiano, Sicily, Italy, Mediterranean, Europe

Agave succulent plant and active volcano 3350m Mount Etna seen at this northeast tourist town, Taormina, Catania Province, Sicily, Italy, Mediterranean, Europe

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

Glowing active volcanic crater of Volcan Telica on a starry night, with the Milky Way, Orion and the Pleiades, Leon, Nicaragua, Central America

Glowing active 700m wide volcanic crater of Volcan Telica with lava vents far below, in the North West volcanic chain, Leon, Nicaragua, Central America

Smoking 700m wide crater of Volcan Telica in the North West volcano chain, one of the country's most active volcanoes, Leon, Nicaragua, Central America

Hikers enjoy the view on the verdant slopes of the active Tungurahua Volcano that threatens the nearby town of Banos, Ambato Province, Central Highlands, Ecuador, South America

Smoke rises from the active crater of Tungurahua Volcano that threatens the nearby town of Banos, Ambato Province, Central Highlands, Ecuador, South America

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

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

Farm buildings and green fields with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Climber looking at sunrise on Volcan Cotopaxi, 5897m, highest active volcano in the world, Ecuador, South America

limbers on the glacier of Volcan Cotopaxi, at 5897m the highest active volcano in the world, Ecuador, South America

Summit of 1745m active Volcan San Cristobal on left, the country's highest volcano, and Volcan Casita on the right, Chinandega, Nicaragua, Central America

Summit of active Volcan San Cristobal, 1745m, in the North West volcano chain, the country's highest volcano, Chinandega, Nicaragua, Central America

Mount Bromo (Gunung Bromo), an active volcano, erupting at sunrise throwing up ash clouds, East Java, Indonesia, Southeast Asia, Asia

Mount Ruapehu, Ngauruhoe and Tongariro (active volcanoes) from Lake Taupo, North Island, New Zealand, Pacific

Glowing active volcanic crater of Volcan Telica at night with star trails and shooting star (meteor) on right, Leon, Nicaragua, Central America

Fields north of Leon and Volcan Telica, one of the country's most active volcanoes, in the North West volcanic chain, Leon, Nicaragua, Central America

Fields north of Leon and Volcan Telica, one of the country's most active volcanoes, in the North West volcanic chain, Leon, Nicaragua, Central America

Sunrise over the smoking Gunung Bromo volcano, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

Active Gunung Bromo volcano at night, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

The very active lava lake of Mount Nyiragongo, Virunga National Park, UNESCO World Heritage Site, Democratic Republic of the Congo, Africa

Tourists walking through lava field around the very active Erta Ale shield volcano, Danakil depression, Ethiopia, Africa

Landscape covered in volcanic ash and dust with the ash plume of the Eyjafjallajokull eruption in the distance, southern area, Iceland, Polar Regions

Sunrise over the smoking Gunung Bromo volcano, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

Tourists exploring White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Active Gunung Bromo volcano at night, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

Group of hikers walking up to Mount Etna summit, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Tourists exploring White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Road leading to Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Aerial of the crater of Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

The caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Mount Rinjani caldera, Segara Anak lake and the active volcano, Gunung Baru, Lombok, Indonesia, Southeast Asia, Asia

Tourists exploring White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Distant view towards mountains with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Crater at the top of Sibayak Volcano, an active volcano at Berastagi (Brastagi), North Sumatra, Indonesia, Southeast Asia, Asia

Cotopaxi National Park, a large forested area known for the active, snow-capped Cotopaxi volcano, Ecuador, South America

Road leading to Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific