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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

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

Mount Etna volcano rising above Taormina at sunrise, East Coast of Sicily, Italy, Mediterranean, Europe

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Multi-coloured crater lakes at summit of Kelimutu volcano, eastern Flores, Nusa Tenggara, Indonesia, Southeast Asia, Asia

Desert road stretching into the distance with rocky mountains under a clear blue sky in Tenerife, Canary Islands, Spain, Atlantic, Europe

Scenic view of a small town with traditional buildings against a backdrop of mountains under a clear blue sky in Tenerife, Canary Islands, Spain, Atlantic, Europe

Hikers are dwarfed by the volcanic Mount Ngauruhoe on the Tongariro Crossing trail, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Road leading to cone of Mount Corona volcano and Ye village, Haria, Lanzarote, Canary Islands, Spain, Atlantic, Europe

The 2652 metre tall Osorno Volcano, a conical stratovolcano, in northern Patagonia near Puerto Montt, Chile, South America

The volcanic mountain chain of the Virunga National Park, UNESCO World Heritage Site, Democratic Republic of the Congo, Africa

Valley of Ten Thousand Smokes with ignimbrite of 1912 eruption, Griggs volcano behind, Katmai National Park, Alaska, USA, North America

Tourists exploring an old lava flow from an eruption of Mount Etna Volcano, UNESCO World Heritage Site, Sicily, Italy, Europe

The caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Waturaka valley, below Kelimutu volcano, Moni, eastern Flores, Nusa Tenggara, Indonesia, Southeast Asia, Asia

View from Mirador del Rio of ferry ship approaching Caleta del Sebo, La Graciosa island, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Tourists swimming in hot pools and waterfalls on Mount Rinjani volcano crater, Lombok, Indonesia, Southeast Asia, Asia

Mount Rinjani caldera, Segara Anak lake and the active volcano, Gunung Baru, Lombok, Indonesia, Southeast Asia, Asia

Quilotoa, a water-filled caldera and the most western volcano in the Ecuadorian Andes, Ecuador, South America

Panorama of Quilotoa, a water-filled caldera and the most western volcano in the Ecuadorian Andes, Ecuador, South America

Snowy peak, lush forests, from Lake Todos Los Santos, Emerald Lake, Vicente Perez Rosales National Park, Lakes District, 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

Lake Myvatn, bird protected area in autumn, north-west shore of lake, looking eastwards, Hverfjall volcano visible in the distance, Myvatn, north Iceland, Iceland, Polar Regions

Tourists exploring an old lava flow from an eruption of Mount Etna Volcano, UNESCO World Heritage Site, Sicily, Italy, Europe

Volcan de Popocatepetl, 5452m, from Volcan de Iztaccihuatl, 5220m, Sierra Nevada, Mexico, North America

Cacti on Isla de los Pescadores, Volcan Tunupa and the salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America

The Laguna Verde or Green Lagoon with Volcan Licancabur in background, Eduardo Avaroa Andean Fauna National Reserve, Southwest Highlands, Bolivia, South America

Tourists exploring White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Climber on Ruminahui Volcano summit, Cotopaxi National Park, Avenue of Volcanoes, Ecuador, South America

Sacred Heart of Jesus Catholic Church (Iglesia Sagrado Corazon de Jesus) with Llanquihue Lake and Osorno Volcano behind, Puerto Varas, Chile Lake District, Chile, South America

Climbers near the summit of Cotopaxi Volcano 5897m glacier covered summit, Cotopaxi National Park, Cotopaxi Province, Ecuador, South America

View of the haze around the peak of Soufriere Hills volcano, Montserrat, Leeward Islands, Lesser Antilles, West Indies, Caribbean, Central America

Desolate black ash landscape at the foot of Hverfjall (Hverfell) volcano, Myvatn, northern Iceland, Iceland, Polar Regions

Showa Shin-zan lava dome, that grew from nothing in 1945, on flank of Usu volcano, Shikotsu-Toya National Park, Hokkaido, Japan

Life beneath a volcano of Gunung Agung, which last erupted in 1963, Bali, Indonesia, Southeast Asia, Asia

Church and park in this tourist hub town near the hot springs and Arenal Volcano, La Fortuna, Alajuela Province, Costa Rica, Central America

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Cacti on Isla de los Pescadores, Volcan Tunupa and the salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America

Mountain summit rising high above the clouds taken from Mount Rinjani volcano, Lombok, Indonesia, Southeast Asia, Asia

Panorama of Quilotoa, a water-filled caldera and the most western volcano in the Ecuadorian Andes, Ecuador, South America

Petrohue, snow-capped, conical Osorno volcano, Lake Todos Los Santos, Vicente Perez Rosales National Park, Lakes District, Chile, South America

Griggs volcano overlooks Valley of Ten Thousand Smokes filled by ash in 1912 eruption of Katmai, Katmai Volcano National Park, Alaska, USA, North America

Volcano and wind swept trees, Lake District, Puyehue National Park, southern Chile, Chile, South America

View from the public garden Parco Duca di Cesaro to Giardini Naxos and Mount Etna, Taormina, Sicily, Italy, Europe

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

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

Crater at the top of Sibayak Volcano, an active volcano at Berastagi (Brastagi), North Sumatra, Indonesia, Southeast Asia, Asia

Small volcano and mountains in Nordunamshraun, seen from Namshraun, Landmannalaugar area, Fjallabak region, Iceland, Polar Regions

Mount Bromo, a volcano reaching 2392m, and Mount Semeru at 3676m early in the morning, Java, Indonesia, Southeast Asia, Asia

Water turning to steam by subterranean heat, Islote de Hilario, Timanfaya National Park, Lanzarote, Canary Islands, Spain

Tourist walking around the crater rim at the 3726m summit of Mount Rinjani volcano, Lombok, Indonesia, Southeast Asia, Asia

Mount Ngauruhoe Volcano summit climb, an extra on the Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific