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Waterfall beneath Mount Mayon, 2462m, a volcanic cone with plume of smoke, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia

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

Oldonyo Lengai volcano, 2878m, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Eruption of Gunung Merapi, a highly active volcano near Yogyakarta, Java, Indonesia, Southeast Asia, Asia

Haleakala National Park, volcanic landscape and summit visitors center, Maui Island, Hawaii, United States of America, North America

Tourist walks round Masaya crater, Santiago crater, Park National Volcan Masaya, Masaya, Nicaragua, Central America

St. Pierre Bay, with Mont Pelee behind, scene of 1902 volcanic disaster, which killed 30,000 people, Martinique, Windward Islands, West Indies, Caribbean, Central America

Spectacular 600m volcanic cliffs of the Risco de Famara rising over Lanzarote's finest beach at Famara, with its low-rise bungalow development, Famara, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe

Mount Krakatindur, 858 m, standing solitary in the Nyjahraun lava field, east of Hekla volcano in the distance, Fjallabak route north (Nyrdri-Fjallaback) in the interior, Iceland, Polar Regions

Looking north to Lover's Bay with two Norfolk Island pines by the lagoon with the world's most southerly coral reef, on this 10km long ancient volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Eroded calcarenite rock (cemented coral sands) with Mount Lidgbird and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific Ocean.

Hot air balloons over volcanic landscape in the dawn sky above Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

View across the rim of the dormant San Fernando crater of the Volcan Masaya in the Volcan Masay National Park, Nicaragua, Central America

Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

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

Blahylur crater lake in the Landmannalaugar area,Tjorvafell, 843 m in the distance, Fjallabak region, Iceland, Polar Regions

Third crater from the summit of Irazu, highest in Costa Rica at 3432m, last erupted 1994, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America

Tourists walking on lava flow on Isla Santiago, Sullivan Bay, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Lava flow from the Piano del Lago cone destroying the cable car above Rifugio Sapienza on the south flank of Mount Etna during the 2001 eruptions, Sicily, Italy, Europe

Spirit Lake in the landscape north of Mount St. Helens devastated by the 1980 eruption, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

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

Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

Christie's Hole, eroded volcanic rock coast of Papa Stour (Great Island of the Priests), Shetland Islands, Scotland, United Kingdom, Europe

Irregular blocky lava (a'a) and cinder cones of the volcanic landscape of Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe

Tourists on walking tour, Isla Santa Cruz, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Steam cloud rising where lava from the Pu'u O'o cinder cone far inland enters sea on southeast Puna coast near Kaimu, Big Island, Hawaii, Hawaiian Islands, United States of America, Pacific, North America

Road through volcanic landscape near Tiscamanita, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Part of the vast crater of 10023 ft Haleakala, the world's largest dormant volcano, seen from Sliding Sands trail, Maui, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Eshaness basalt cliffs, Calder's Geo, ancient volcanic crater, coast deeply eroded with caves, blowholes and stacks, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe

Mount Teide (Pico del Teide) from the east, Parque Nacional de Las Canadas del Teide (Teide National Park), Tenerife, Canary Islands, Spain, Europe

Valagja Gorge, a bright-coloured volcanic fissure north-east of Mount Hekla volcano, south Iceland (Sudurland), Iceland, Polar Regions

Volcanic cinder cone on Graciosa Island and the Graciosa to Lanzarote ferry in the Rio strait, seen from the Mirador del Rio on the north west coast of Lanzarote, Graciosa Island, Canary Islands, Spain, Atlantic, Europe

View south from Kim's Lookout to Mount Lidgbird on the left and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Leirhnjukur thermal area and eruption site, near Krafla geothermal power station, Lake Myvatn, North area, Iceland, Polar Regions

Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Looking across the old crater towards the smoking 2438m summit of the active volcano Mount Canison, Visayan island of Negros, Philippines, Southeast Asia, Asia

Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

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

Cacti, Stromboli Island, Eolian Islands (Aeolian Islands), UNESCO World Heritage Site, Italy, Mediterranean, Europe

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America

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

Russian truck stops at a viewpoint over the lava sand field of the Tolbachik volcano, Kamchatka, Russia, Eurasia

Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Cinder cones in the centre of the island near Tinajo, a relic of the island's active volcanic past, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe

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

Steaming volcanic mud pools, Rincon de la Vieja National Park at foot of Rincon Volcano, Guanacaste, Costa Rica, Central America

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

Hikers in front of Mount Ngauruhoe, 2287m, on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific

The two great 13000ft volcanic peaks of Mauna Loa on right, and Mauna Kea on the Big Island seen from the top of the Haleakala volcano, Maui, Hawaii, Hawaiian Islands, United States of America, Pacific, North America

Active mud flow from line of mud volcanoes, in the Firuze crater, Gobustan, Baku, Azerbaijan, Central Asia, Asia

Mount Lidgbird on the left and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Cattle grazing in a field with the Osorno volcano behind in the Lake District in Chile, South America

Hikers at Red Crater on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

Moss covered lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

Dormant volcano, Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific

Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

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

A family walking the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific