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Eruption and lava flow from the Monti Calcarazzi fissure on the southern flank of Mt Etna in 2001, the flow threatened the town of Nicolosi below, Mt Etna, Sicily, Italy

Koryaksky volcano seen beyond walkers on crater rim of Avacha volcano, Kamchatka, East Siberia, Russia

Black and white chinstrap penguins, black volcanic beach and black glacier, Deception Island, Antarctica, Polar Regions

Tourists ascending recent volcanic cone, Penguin Island, South Shetland Islands, Antarctica, Polar Regions

Panoramic view of the town of Uchisar with its old houses and ancient cave dwellings in the volcanic tufa, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Panoramic view of ancient cave dwellings in the volcanic tufa formations, Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Panoramic view of tufa formations near the town of Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Panoramic view of tufa formations, Valley of the Fairy Chimneys (Pasabag), near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, 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

View from Mount Ruapehu of Mount Ngauruhoe with a ski cottage in the foreground, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Woman on Mount Ruapehu looking towards Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Ski cottage on Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Ski cottage on Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Fagrifoss waterfall on the slopes of Laki crater, Lakagigar, highlands region, Iceland, Polar Regions

Cerro Catedral and Lago Toncek, Nahuel Huapi National Park, Bariloche, Patagonia, Argentina, South America

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

Hot air balloon flight over the famous volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Volcanic tufa formations, known as fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Rocky volcanic badlands (malpais) landscape, Malpais Grande National Park, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Crateri Silvestri view, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

Crateri Silvestri view, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America

Malpais badlands volcanic landscape looking northeast from Los Hervideros, Parque Natural Los Volcanes, near Yaiza, Lanzarote, Canary islands, Spain, Atlantic, Europe

Grape vines growing in black volcanic pits in La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Grape vines growing in black volcanic pits in La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Volcanic landscape of solidified lava flows and distant cone volcanoes, near Yaiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Volcanic landscape, Mount Pico Partido, Parque Nacional de Timanfaya, national park, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Walkway over lava field, Timanfaya Volcano Interpretation and Visitors' Centre, Lanzarote, Canary Islands, Spain, Atlantic, 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

Jardin de Cactus designed by Cesar Manrique, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

El Triunfador sculpture, Fundación Cesar Manrique, Taro de Tahíche, Lanzarote, Canary islands, Spain, Atlantic, Europe

Basalt columns next to Fingal's Cave on the Isle of Staffa, with Mull in the background, Inner Hebrides, Scotland, United Kingdom, Europe

View of basalt columns in Fingal's Cave on the isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe

Natural pinnacles in volcanic ash, Zemi Valley, Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Natural pinnacles in volcanic ash, Zemi Valley, Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Valle de los Hongos (Mushroom Rocks) formed of volcanic ash, Creel, Chihuahua, Mexico, North America

Old lighthouse in the volcanic landscape of Iceland near Akranes, the ninth most populous city in the country, Iceland, Polar Regions

Cactus plants inside Jardin de Cactus designed by Cesar Manrique, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Ruins of pre-Spanish Mahos village, Poblado de la Atalayita, Pozo Negro, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Footpath trail from Gran Valle to Cofete, Jandia peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Montana de Medio, mountain, Los Ajaches mountain range, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Atlantic coast in south west corner, Los Charcones, Caleta Negra bay, near Playa Blanca, Lanzarote, Canary islands, Spain, Atlantic, Europe

Monumento a la Fecundidad by Cesar Manrique, Monumento al Campesino, San Bartolome, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Food being cooked on volcanic grill at visitor centre, Parque Nacional de Timanfaya, national park, Lanzarote, Canary Islands, Atlantic, Europe

Volcanic landscape with rocky terrain in the foreground and a clear blue sky over the ocean in the background in Tenerife, Canary Islands, Spain, Atlantic, Europe

Close-up of plant, Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

View from El Mirador del Rioi, La Graciosa island and El Rio channel, Chinjo archipelago natural park, Lanzarote, Canary Islands, Spain, Atlantic, Europe

The mouth of Fingal's Cave, Staffa Island, with Mull in the distance, Inner Hebrides, Scotland, United Kingdom, Europe

Ruins of pre-Spanish Mahos village, Poblado de la Atalayita, Pozo Negro, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Malpais badlands volcanic landscape Montana Negra and Caldera Colorada, Parque Natural Los Volcanes, Masdache, Lanzarote, Canary islands, Spain, Atlantic, Europe

Walkway over lava field, Timanfaya Volcano Interpretation and Visitors' Centre, Lanzarote, Canary Islands, Spain, Atlantic, 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

Ancient cave dwellings in the tufa formations at Goreme Open Air Museum, Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Sand dunes at Las Dunas natural park, Corralejo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Golf course in a volcanic crater, Heimaey Island, Vestmannaeyjar, volcanic Westman Islands, Iceland, Polar Regions

Euphorbia balsamifera growing on lava flows Malpais de Corona, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Panorama of sulphur worker appearing out of toxic fumes at Kawah Ijen volcano, East Java, Indonesia, Southeast Asia, Asia

Pigeon cotes cut in volcanic rock, apricot trees in foreground, Uchisar, Cappadocia, Turkey, Eurasia

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

Cactus plants inside Jardin de Cactus designed by Cesar Manrique, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Sandy beach of Playa de las Conchas, Graciosa island, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Coastal landscape near Majanicho on north coast of Fuerteventura, Canary Islands, Spain, Atlantic, 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

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

Ruins of pre-Spanish Mahos village, Poblado de la Atalayita, Pozo Negro, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Cactus plants and windmill Jardin de Cactus designed by Cesar Manrique, Guatiza. Lanzarote, Canary Islands, Spain, Atlantic, Europe

Cactus plants inside Jardin de Cactus designed by Cesar Manrique, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Scenic view of a tranquil volcanic landscape with clear blue sky in Tenerife, Canary Islands, Spain, Atlantic, Europe

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

Volcanic desert landscape and its fabulous geographical structures caught in evening light, Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

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

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

Saint Michel d'Aiguilhe Chapel situated on the top of volcanic rock, Le Puy en Velay, Haute-Loire, Massif Central, France, Europe

View from the San Pedro volcano of San Pedro and Lago Atitlan (Lake Atitlan), Guatemala, Central America

Coastal landscape near village of Majanicho on the north coast, Fuerteventura, Canary Islands, Spain, Atlantic, 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

Pinnacles of volcanic ash, Urgup, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Interesting volcanic rock formations surrounding the town of Hanavave, Fatu Hiva, Marquesas, French Polynesia, South Pacific, Pacific