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Third crater, created in 1994 and containing green lake, Irazu Volcano, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America

Eruption and lava flow from the Monti Calcarazzi fissure on the southern flank of Mt Etna in 2001, the flow threatened the town of Nicolosi below, Mt Etna, Sicily, Italy

Gorely volcano, tundra plants on slopes, summit crater rims on skyline, Kamchatka, East Siberia, Russia

Koryaksky volcano, andesitic cone seen from shoulder of Avacha volcano, Kamchatka, East Siberia, Russia

Koryaksky volcano seen beyond walkers on crater rim of Avacha volcano, Kamchatka, East Siberia, Russia

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

Restored buildings in Roman town buried in AD 79 by ash flows from Mount Vesuvius, in the background, Pompeii, UNESCO World Heritage site, Campania, Italy, Europe

Tourists ascending recent volcanic cone, Penguin Island, South Shetland Islands, Antarctica, Polar Regions

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

Backlit image of workers loaded with sulphur pieces cut out from a sulphur mine on Ijen crater lake, Java, Indonesia, Southeast Asia, Asia

Fully loaded baskets of sulphur ready to be carried out of the Ijen Volcano, Java, Indonesia, Southeast Asia, Asia

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

Worker carrying fully loaded baskets of sulphur out of the Ijen Volcano, Java, Indonesia, Southeast Asia, Asia

Salt pans and volcanoes in the background, near Yaiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

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

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

Volcanic cone and Situ Cangkuang lake by this village, known for its Hindu temple, Kampung Pulo, Garut, West 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

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

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

Icelandic horses near Snorrastadir, Eldborg volcano, snow-covered peaks of Ljosufjoll and Eldborg volcano visible behind, Snaefellsnes Peninsula, West Iceland, Iceland, Polar Regions

Aerial view of of Virunga National Park (Parc National des Volcans) showing the boundary of the park and agricultural land, Virunga Volcanoes, Rwanda, 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 Karisimbi, a dormant volcano in the Virunga Mountains on the border between Rwanda and the Democratic Republic of Congo (DRC), flanked by Mount Mikeno to the north, Mount Bisoke to the east and Mount Nyiragongo to the west, Great Rift Valley, Africa

Aerial view of Mount Karisimbi, a dormant volcano in the Virunga Mountains on the border between Rwanda and the Democratic Republic of Congo (DRC), at 4507m the highest of the mountain range, 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 Visoke (Mount Bisoke), an extinct volcano, straddling border of Rwanda and the Democratic Republic of the Congo. with Mount Mikeno in background, Virunga Volcanoes, Great Rift Valley, Africa

Aerial view of Mount Sabyinyo, an extinct volcano and oldest of the Virunga Mountains, the summit at 3645ï¾ metres marks the intersection of the borders of Democratic Republic of the Congo (DRC), Rwanda, and Uganda, Virunga Volcanoes, Africa

Aerial view of Mount Visoke (Mount Bisoke), an extinct volcano straddling the border of Rwanda and Democratic Republic of the Congo (DRC) showing crater lake, with Mount Mikeno in background, Virunga Volcanoes, 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

Tourist admiring the view of Mount Etna from Teatro Greco (Greek Theatre), Taormina, Sicily, Italy, Europe

Sunrise hitting the top of Mount Etna volcano, Taormina, East Coast of Sicily, Italy, Mediterranean, Europe e

Mount Etna Volcano, shrine where the lava from an eruption stopped, UNESCO World Heritage Site, Sicily, Italy, Europe

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

Hiker in red jacket walking down new footpath across the volcanic landscape towards Madeira's third highest peak, Pico do Arieiro, Madeira, Portugal, Europe

Majestic night sky with Milky Way over a serene mountain landscape in the Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Starry night sky over majestic mountain landscape with Milky Way visible and rocky terrain in the foreground, Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Volcanic landscape, Valle del Bove, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

View of lava fields and snow-capped peaks in the distance, Etna, Sicily, Italy, Mediterranean, Europe

View of lava fields and snow-capped peaks in the distance, Etna, Sicily, Italy, Mediterranean, Europe

Death Valley (Valle de la Muerte) and Licancabur Volcano, San Pedro de Atacama, Atacama Desert, North Chile, Chile, South America

Nikia village and Nisyros volcano in the distance, high anlgle view, Nisyros Island, Dodecanese Islands, Greek Islands, Greece, Europe

Starry night sky over a volcanic landscape with a colorful twilight gradient in Tenerife, Canary Islands, Spain, Atlantic, Europe

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

Mount Bromo, a volcano reaching 2392m, and Mount Semeru at 3676m early in the morning, Java, Indonesia, Southeast Asia, Asia

Mount Bromo, a volcano reaching 2392m, and Mount Semeru at 3676m early in the morning, Java, Indonesia, Southeast Asia, Asia

Excursion by camel to visit volcano, National Park of Timanfaya, Lanzarote, Canary Islands, Spain, Europe

Excursion by camel to visit volcano, National Park of Timanfaya, Lanzarote, Canary Islands, Spain, Europe

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