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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

View north across fields at Chichigalpa to Volcan San Cristobal at the northwest end of Nicaragua's chain of volcanoes, Nicaragua, Central America

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

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

Pigeon cotes cut in volcanic rock, apricot trees in foreground, Uchisar, Cappadocia, Turkey, Eurasia

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

The top of the volcanic cone of Mount Ngauruhoe in the Tongariro National Park in the Wellington area of the North Island of New Zealand, Australasia

Ruins of Pompeii, destroyed in volcanic eruption of AD 79, Pompeii, UNESCO World Heritage site, Campania, Italy, Europe

Krill swarm cooked pink by fumarole activity on the volcanic island of Deception Island, Antarctica, Polar Regions

Black and white chinstrap penguins, black volcanic beach and black glacier, Deception Island, Antarctica, Polar Regions

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

Panoramic view of the town of Uchisar with its old houses and ancient cave dwellings in the volcanic tufa, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Panoramic view of ancient cave dwellings in the volcanic tufa formations, Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Panoramic view of tufa formations near the town of Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Panoramic view of tufa formations, Valley of the Fairy Chimneys (Pasabag), near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Hikers, volcanic scenery and hiking trail, Kirishima National Park, Kagoshima prefecture, Kyushu, Japan, Asia

Late winter hikers on snowfield in South Crater on Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, South Auckland, North Island, New Zealand, Pacific

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

View along volcanic cliffs towards distant Fira, Imerovigli, Santorini (Thira) (Thera), Cyclades Islands, South Aegean, Greek Islands, Greece, Europe

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

Backpacker walking across dried up lake towards Llaima volcano, Conguillio National Park, Chile, South America

The colourful multi hued Champagne Pool, Wai-O-Tapu Thermal Wonderland, Waiotapu, North Island, New Zealand, Pacific

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

Volcanic cones, palm trees and lake in rural area near Kampung Pulo, Kecamatan Leles, 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

Wreckage of a United States Navy Douglas Super DC-3 that crashed on the black beach at Solheimasandur, South Region, Iceland, Polar Regions

Fagrifoss waterfall on the slopes of Laki crater, Lakagigar, highlands region, Iceland, Polar Regions

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

Church belfry ruins and volcanic cone with smoke plume of Mount Mayon, 2462m, Cagsawa, where 1200 people were buried alive in 1814 eruption, Bicol Province, Luzon Island, Philippines, Southeast Asia, Asia

Volcanic cone with plume of smoke of Mount Mayon, 2462m, and grotto or wayside shrine, Bicol Province, Luzon Island, Philippines, Southeast Asia, Asia

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

Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bus and the famous El Nariz del Diablo (The Devil's Nose) train en route to Riobamba with Chimborazo volcano in the distance, Riobamba, Chimborazo Province, Central Highlands, Ecuador, South 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

Cape buffalo (African buffalo) (Syncerus caffer) with a red-billed oxpecker (Buphagus erythrorhynchus), Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania,East Africa,Africa

Cerro Catedral and Lago Toncek, Nahuel Huapi National Park, Bariloche, Patagonia, Argentina, South America

Petroglyphs at the archeological site of Orongo Ceremonial village high on the crater rim of Ranu Kau, Rapa Nui (Easter Island), UNESCO World Heritage Site, Chile, South America

Tourists looking into the crater and view from the rim into the crater of Ranu Kau, Rapa Nui (Easter Island), Chile, South America

A bright pink purple paddle-flap scorpionfish {Rhinopias eschmeyeri) on volcanic sand, Tulamben, Bali, Indonesia, Southeast Asia, Asia

Icebergs at sunrise on Jokulsarlon Beach, a black volcanic sand beach in South East Iceland, Iceland, Polar Regions

Hot air balloon flight over the famous volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Volcanic tufa formations, known as fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Steam plume from rising dome within crater, Mount St. Helens, Washington state, United States of America, North America

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

Cactus plants inside Jardin de Cactus designed by Cesar Manrique, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Aso volcanic calder, see from Shiroyama viewpoint, with profile of Nakadake volcano like Sleeping Buddha; Kyushu, Japan

Golf course in a volcanic crater, Heimaey Island, Vestmannaeyjar, volcanic Westman Islands, Iceland, Polar Regions

Puffin (Fratercula arctica), Heimaey Island, Vestmannaeyjar, volcanic Westman Islands, Iceland, Polar Regions

Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America

Piece of glacial ice washed ashore by the incoming tide onto beach of volcanic sand near glacial lagoon at Jokulsarlon, Iceland, Polar Regions

Small red volcano and volcanic hills in Domadalshraun just north of Landmannalaugar, Fjallabak region, Iceland, Polar Regions