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View north across fields at Chichigalpa to Volcan San Cristobal at the northwest end of Nicaragua's chain of volcanoes, Nicaragua, Central America
Volcanic Air Bubbles at Champagne Beach, Caribbean Sea, Dominica
View from the San Pedro volcano of San Pedro and Lago Atitlan (Lake Atitlan), Guatemala, Central America
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Puffin (Fratercula arctica), Heimaey Island, Vestmannaeyjar, volcanic Westman Islands, Iceland, Polar Regions
Volcanic beach in front of the glacier ice of Deception Island, South Shetland Islands, Antarctica, Polar Regions
The lagoon with the world's most southerly coral reef, at this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific
Summit of 1745m active Volcan San Cristobal on left, the country's highest volcano, and Volcan Casita on the right, Chinandega, Nicaragua, Central America
Bubbling mud, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Sulphur miners working in the crater at Kawah Ijen, Java, Indonesia, Southeast Asia, Asia
Lake Helen and Mount Lassen, 3187 meters, in the background, Lassen Volcanic National Park, California, United States of America, North America
Basalt columns and a tourist ferry, Staffa Island, Inner Hebrides, Scotland, United Kingdom, Euorpe
Natural pinnacles in volcanic ash, Zemi Valley, Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Black lava beach with reflected mountain, Barilochie, Patagonia, Argentina, South America
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica, Central America
Volcanic Island San Benedicto, Revillagigedo Islands, Mexico
Volcanic Island San Benedicto, Revillagigedo Islands, Mexico
Road leading to Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
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
The west flank of 6310m Volcan Chimborazo, with its unique type of Andean high paramo (puna) made dry by the rain shadow, Chimborazo Province, Central Highlands, Ecuador, South America
Tourist standing on the edge of the Darvaza Gas crater, Turkmenistan, Central Asia, Asia
Golf course in a volcanic crater, Heimaey Island, Vestmannaeyjar, volcanic Westman Islands, Iceland, Polar Regions
Diverging plates in a volcanic fissure zone, Myvatn, Iceland, Polar Regions
Landscape covered in volcanic ash and dust with the ash plume of the Eyjafjallajokull eruption in the distance, southern area, Iceland, Polar Regions
Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America
Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America
Cacti on Isla de los Pescadores, Volcan Tunupa and the salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America
Poas Volcano, Poas National Park, Costa Rica, Central America
Volcanic crater (rano), Rano Kau, Easter Island, Chile
Panoramic view of volcanic landscape near the village of Cavusin, near Goreme, Cappadocia, Anataolia, Turkey, Asia Minor, Asia
Backpacker walking across dried up lake towards Llaima volcano, Conguillio National Park, Chile, South America
Volcanic cones, palm trees and lake in rural area near Kampung Pulo, Kecamatan Leles, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
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
Smoke plume rising over glacier, Eyjafjallajokull volcano, Iceland, Polar Regions
Endemic kentia palms that are also cultivated for worldwide sale with 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
Basalt columns, Staffa Island, Inner Hebrides, Scotland, United Kingdom, Europe
Volcanic beach below Volcano Tavurvur, Rabaul, East New Britain, Papua New Guinea, Pacific
Hikers out on the Atacama Salt Flats, with snow-capped volcanic peaks in the background, near San Pedro de Atacama, Chile, South America
View of Aeolian Islands archipelago from Gran Cratere, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe
Castle Geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA
Volcanic Air Bubbles at Champagne Beach, Caribbean Sea, Dominica
Volcanic Island San Benedicto, Revillagigedo Islands, Mexico
Volcanic Island San Benedicto, Revillagigedo Islands, Mexico
Volcanic Island San Benedicto, Revillagigedo Islands, Mexico
Volcaic ashes at Salto Truful, Volcan Llaima, Conguillio National Park, Lakes District, southern Chile, South America
Mauna Kea, Big Island, Hawaii, United States of America, North America
Multi-coloured crater lakes at summit of Kelimutu volcano, eastern Flores, Nusa Tenggara, Indonesia, Southeast Asia, Asia
Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America
Saint Michel d'Aiguilhe Chapel situated on the top of volcanic rock, Le Puy en Velay, Haute-Loire, Massif Central, France, Europe
Wai-O-Tapu Thermal Wonderland, Rotorua, North Island New Zealand, Pacific
Mount Bromo volcanic eruption sending up an ash cloud, East Java, Indonesia, Southeast Asia, Asia
Mount Bromo volcano erupting at sunrise, sending volcanic ash high into the sky, East Java, Indonesia, Southeast Asia, Asia
Volcano eruptions at the Volcano Yasur, Island of Tanna, Vanuatu, South Pacific, Pacific
Jungman Daepo columnar jointed lava formation, Seogwipo, Jeju Island, UNESCO World Heritage Site, South Korea, Asia
Lassen Volcanic National Park, California, United States of America, North America
Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Volcanic plateau of Sierra Tarahumara, above Copper Canyon, Chihuahua, Mexico, North America
Volcanic Gas Bubbles, Komodo National Park, Indonesia
Koryaksky volcano, 3456m high, conical andesite volcano, Kamchatka, East Siberia, Russia
Volcanic Air Bubbles at Champagne Beach, Caribbean Sea, Dominica
Volcanic Air Bubbles at Champagne Beach, Caribbean Sea, Dominica
Volcanic Air Bubbles at Champagne Beach, Caribbean Sea, Dominica
Volcanic Island San Benedicto, Revillagigedo Islands, Mexico
Erosion with volcanic tuff pillars near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Castle Hill, basalt core of an extinct volcano, Edinburgh, Scotland, United Kingdom, Europe
Solfatara, volcanic crater with active fumaroles, Pozzuoli, Naples, Campania, Italy, Europe
Kasha-Katuwe Tent Rock National Monument, tent like rock formations, from volcanic eruptions 6 to 7 million years ago, New Mexico, United States of America, North America
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
Bubbling mud, Waiotapu Thermal Area, Rotorua, North Island, New Zealand, Pacific
Tourists exploring White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific
Casts of people buried in the destruction, Pompeii, Campania, Italy
Griggs volcano overlooks Valley of Ten Thousand Smokes filled by ash in 1912 eruption of Katmai, Katmai Volcano National Park, Alaska, USA, North America
Volcanic Air Bubbles at Champagne Beach, Caribbean Sea, Dominica
Volcanic Gas Bubbles in Coral Reef, Ambon, Moluccas, Indonesia
Rock climber attempts bouldering, and volcano in background, Conguillio National Park, Chile, South America
Lava flowing from Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, The Big Island, Hawaii, United States of America, North America
Old Settlement Bay and Mount Lidgbird on left and Mount Gower by the lagoon with the world's most southerly coral reef, volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific
Glassy pieces of ice on volcanic black sand beach with blurred waves, near Jokulsarlon Lagoon, South Iceland, Polar Regions
The view of the mountains of Vestrahorn from black volcanic sand beach with grasses at sunset, Stokksnes, South Iceland, Iceland, Polar Regions
Valley of Ten Thousand Smokes with ignimbrite of 1912 eruption, Griggs volcano behind, Katmai National Park, Alaska, USA, North America
The Blue Lake, a natural reservoir and one of three crater lakes at the top of Mt Gambier, an extinct volcano and town in the south east of the state, South Australia, Australia
Frying Pan Lake,the largest hot spring in the world, Waimangu Volcanic Valley, North Island, New Zealand, Pacific
Mimosa rocks and rock pool in natural bay composed of volcanic Rhyolite rock, around 360 million years old, Mimosa Rocks National Park, New South Wales, Australia, Pacific
Darvaza Gas crater, Turkmenistan, Central Asia, Asia
Cruise ship anchoring in the volcanic crater of Deception Island, South Shetland Islands, Antarctica, Polar Regions
Cruise ship anchoring in the volcanic crater of Deception Island, South Shetland Islands, Antarctica, Polar Regions
Small red volcano and volcanic hills in Domadalshraun just north of Landmannalaugar, Fjallabak region, Iceland, Polar Regions
Typical Greek village perched on volcanic rock with white and blue houses and windmills, Santorini, Cyclades, Greek Islands, Greece, Europe
Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America
Overlooking recent lava flow on Heimaey Island, Iceland, Polar Regions
Icelandic horses with volcanic mountains in the distance, South Iceland, Iceland, Polar Regions
Volcanic desert landscape and its fabulous geographical structures caught in evening light, Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Cacti on Isla de los Pescadores, Volcan Tunupa and the salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America
The town of Orchisar, showing the old tunneled houses dug into the volcanic rock, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Icebergs on a black sand volcanic beach next to the Jokulsarlon glacial lake in Vatnajokull National Park, southeast Iceland, Polar Regions
Pieces of glacier ice washed up on black volcanic sand beach at sunrise, near Jokulsarlon Glacial Lagoon, South Iceland, Polar Regions
Black volcanic sand on six mile beach near Limbe, southern Cameroon, Africa
Interesting volcanic rock formations surrounding the town of Hanavave, Fatu Hiva, Marquesas, French Polynesia, South Pacific, Pacific
Etna South, Mount Etna, UNESCO World Heritage Site, Catania, Sicily, Italy, Europe
Coffee plantations on the slopes of the Poas Volcano, near San Jose, Costa Rica