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Sulphur pieces on Iozan (sulfur mountain) active volcano area, Akan National Park, Hokkaido, Japan, Asia

View from Mirador De Morro Velosa on the volcanic island of Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Panoramic image of Fira in the evening with cruiser and volcanic landscape, Santorini, Cyclades, Greek Islands, Greece, Europe

The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Costaline in front of the Quill hill, St. Eustatius, Statia, Netherland Antilles, West Indies, Caribbean, Central America

Lava field in Sullivan Bay, Santiago (James) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Windmill at the Museo del Queso Majorero near Antigua in Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Tourists on camel tour, dromedaries, Parque National de Timanfaya, Lanzarote, Canary Islands, Spain, Atlantic, Europe

A view of the volcanic crater and colourful crater lake on Santa Ana Volcano in Santa Ana, El Salvador, Central America

View of landscape and village of Uga, Uga, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe

Waterfall in Lava Canyon, Mount St. Helens National Volcanic Monument, Washington State, United States of America, North America

Ubehebe Crater, a volcanic crater half a mile across and 600 feet deep, Death Valley National Park, California, United States of America, North America

View of couple overlooking volcanic coastline from Mirador del Rio at sunset, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe

Laguna Miscanti, a brackish lake at an altitude of 4140 meters in the Andean Central Volcanic Zone, Chile, South America

Aerial view of road through volcanic landscape, Timanfaya National Park, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe

The volcanic Roque Nublo in the Nublo Rural Park in the centre of Gran Canaria, Canary Islands, Spain, Atlantic, Europe

Volcanic crater on top of the Haleakala National Park, Maui, Hawaii, United States of America, Pacific

Volcanic crater on top of the Haleakala National Park, Maui, Hawaii, United States of America, Pacific

Evening view over Fira and the volcanic landscape, Santorini, Cyclades, Greek Islands, Greece, Europe

Tejeda with Roque Nublo in the background, Gran Canaria, Canary Islands, Spain, Atlantic Ocean, Europe

Aerial view of road through volcanic landscape, Timanfaya National Park, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe

View of road and volcanic coastline from Mirador del Rio at sunset, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe

View of road and volcanic coastline from Mirador del Rio at sunset, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe

Aerial view of El Cuervo Volcano at sunset, Timanfaya National Park, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe

Deception Island, a dormant volcano, South Shetland Islands, South Atlantic, Antarctica, Polar Regions

Tourists on rim of volcano, active in 1970, one of two in Antarctica, with cruise ship in the background, on Deception Island, Antarctic Peninsula, Antarctica, Polar Regions

The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Late winter hikers on Tongariro crossing, Mount Ngauruhoe and South Crater, Taupo, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Lava flow from the Monti Calcarazzi fissure that threatened Nicolosi on the south flank of Mount Etna in 2001, the Piano del Lago cone destroyed the Sapienza cable car, Sicily, Italy, Europe

Lava flow from the Monti Calcarazzi fissure on the flank of Mount Etna in 2001 which threatened Nicolosi below, Sicily, Italy, Europe

Steam plumes from hot lava flowing onto beach and into the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

4 wheel drive car driving through a colourful volcanic landscape near las rocas de Dali, Los Lipez, Southwestern Bolivia

Panoramic view from hot air balloon of Cappadocian landscape and hot air balloons, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Perfect example of strato-volcano, island cone left by subsidence, Crater Lake, Oregon, United States of America (U.S.A.), North America

Landscape of volcanic hills, looking towards Taiaroa Head, Albatross, near Dunedin, Otago Peninsula, Otago, South Island, New Zealand, Pacific

Silverswords, a plant unique to Hawaii which flowers once then dies, growing in vast crater of Haleakala, the world's largest dormant volcano, Maui, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Masai cattle after rain, Ngorongoro crater, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Lonar meteorite crater, world's only impact crater in basalt, Deccan plateau, Maharashtra, India, Asia

Colourful volcanic rocks of the Andes mountains, along Bolivia-Chile border range, Southwest Highlands, Bolivia, South America

Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America

Vicuna grazing on altiplano desert, with El Misti volcano behind, near Arequipa, Peru, South America

Smoke billowing out from volcano vent, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia

Tourists trekking, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia

Aerial view of La Graciosa Island volcanoes from El Mirador del Rio, Lanzarote, Canary Islands, Spain, Atlantic, Europe

The crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe

Fumaroles on the crater edge, island of Vulcano, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

One of three crater lakes at the summit of Kelimutu volcano near Moni, soil chemical creates the unusual colours, island of Flores, Indonesia, Southeast Asia, Asia

View east along crater rim from Orongo ceremonial village of the Rano Kau crater, Easter Island, Chile, Pacific, South America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

View of the Pitons volcanic mountains, with bougainvillea flowers in foreground, St. Lucia, Windward Islands, West Indies, Caribbean, Central America

Steam issuing from sulphurous fumarole at Gran Craters, Vulcano Island, with islands of Lipari and Salina beyond, Aeolian Islands (Eolian Islands) (Lipari Islands), UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Rincon Volcano from the Hacienda Guachipelin, near Rincon de la Vieja National Park, Guanacaste, Costa Rica, Central America

Skylight, view through cooled lava to molten lava below, with plumes of steam as lava reaches the sea beyond, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island', Hawaii, United States of America, North America

Punaluu Black Sand Beach, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

View of volcanic mountains near Sao Jorge dos Orgaos Botanical Garden, Santiago, Cape Verde Islands, Africa

Walkers and Emerald Lakes on the Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific