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Dromedary ride on slopes of Timanfaya mountain, Timanfaya National Park, Lanzarote, Canary Islands, Spain, Europe

Sulphur carriers climbing out of Kawah Ijen volcano (Ijen crater), Banyuwangi, East Java, Indonesia, Southeast Asia, Asia

Sulphur carriers climbing out of Kawah Ijen volcano (Ijen crater), Banyuwangi, East Java, Indonesia, Southeast Asia, Asia

Man boiling Megapode eggs in a sulphur stream of Volcano Tavurvur, Rabaul, East New Britain, Papua New Guinea, Pacific

Horsemen and horses on the banks of Mount Bromo volcano, Eastern Java, Indonesia, Southeast Asia, Asia

The main square of Granada with view to the Mombacho Volcano in the background, Granada, Nicaragua, Central America

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

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

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

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

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

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

Gros Piton, UNESCO World Heritage Site, and reflection in the swimming pool at Sugar Beach, St. Lucia, Windward Islands, West Indies, Caribbean, Central 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

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

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

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

Hikers on Dome Ridge near the summit of 2797m Mount Ruapehu, highest and most active of the volcanoes in the National Park, Tongariro National Park, UNESCO World Heritage Site, central plateau, North Island, New Zealand, Pacific

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

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

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

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

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

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

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

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

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

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

Summit crater, 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Volcano, 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

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

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