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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

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

Guides dipping twigs in molten sulphur at fumaroles in Papandayan Volcano, Garut, W Java, Java, Indonesia, Southeast Asia, Asia

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

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

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

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

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

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

Ignimbrite exposed in river canyons cut since 1912 eruption, in the Valley of Ten Thousand Smokes, in Katmai Volcano National Park, Alaska, United States of America, North America

Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, 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

Motorhome below Mount Ngauruhoe with Kiwi crossing sign, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, South Pacific

Tourists hiking on an old lava flow from an eruption, Mount Etna, UNESCO World Heritage Site, Sicily, Italy, 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

Summit crater, Volcan Cotopaxi, 5897m, the highest active volcano in the world, Ecuador, South America

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

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

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

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

White cross is a marker to check for land movement within the caldera, with the Pico de Fogo volcano in the background, Fogo (Fire), Cape Verde Islands, Africa

Nisqually Glacier in foreground, with Mount Rainier, the volcano which last erupted in 1882, 4392m high, beyond, Cascade Mountains, Washington State, United States of America (U.S.A.), 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

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

Moai quarry, Ranu Raraku Volcano, UNESCO World Heritage Site, Easter Island (Rapa Nui), Chile, South 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

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

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

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

Lava dome in crater seen from rim, Mount St. Helens after 1980 eruption, with Spirit Lake and Mount Rainier in the distance, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

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

Illustration from Francois Valentijn's 18th century Oud Nieuw Oost-Indien showing the Island of Ternate, Moluccas Indonesia, Southeast Asia, Asia

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

Man walking on dry lake bed with Llaima Volcano in distance, Conguillio National Park, Chile, South America

Tourists hiking on an old lava flow from an eruption, Mount Etna, UNESCO World Heritage Site, Sicily, Italy, Europe

Volcano House, Cesar Manrique Foundation, Tahiche, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Altiplano and high-level volcanoes, El Tatio basin, above Calama, Atacama Desert, Chile, South America

Motorhome below Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, South Pacific

Bus and the famous El Nariz del Diablo (The Devil's Nose) train en route to Riobamba with 6310m Chimborazo volcano in the distance, Riobamba, Chimborazo Province, Central Highlands, Ecuador, South America.

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

Kilauea volcano crater showing solidified ropy lava called pahoehoe, The Big Island, Hawaii, Hawaiian Islands, United States of America, North America

Orange volcano crater, Timanfaya National Park (Fire Mountains), Lanzarote, Canary Islands, Spain, Europe

Ruins at Saint Pierre, where in 1902 Mont Pelee volcano erupted, killing 30000 inhabitants, Martinique, Lesser Antilles, West Indies, Caribbean, Central America

Koryaksky volcano, 3456m high, conical andesite volcano, Kamchatka, UNESCO World Heritage Site, Eastern Siberia, Russia, Eurasia

Russian truck drives through the lava sand field of the Tolbachik volcano, Kamchatka, Russia, Eurasia

Blisters measuring about 10 cm across in boiling mud pool, Mud volcano, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Tourist walking along rim of Gunung Bromo, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

Volcano cone viewed from la Dehesa, with sea beyond, El Hierro, Canary Islands, Spain, Atlantic, Europe

Koryaksky volcano. UNESCO World Heritage Site, behind Stalinist suburban flats, Petropavlovsk, Kamchatka, Eastern Siberia, Russia, Eurasia