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Hellen Lake with Mount Lassen, 3187 m, in the background, Lassen Volcanic National Park, California, United States of America, North America

Avacha volcano, lava plug formed in crater in 1991, Koryaksky volcano beyond, Kamchatka, East Siberia, Russia

Mount Rainier, volcanic peak, and Emmons Glacier from summit icefield, Cascade Mountains, Washington State, United States of America (U.S.A.), North America

Ice shelfs at the entrance of the volcanic island of Deception Island, South Shetland Islands, Antarctica, Polar Regions

Pieces of glacier ice washed up on black volcanic sand beach at sunrise, near Jokulsarlon Glacial Lagoon, South Iceland, Polar Regions

Volcano of Parinacola, 6348m high, reflected in water of Chungara Lake, Parque Nacional de Lauca, Chile, South America

Panoramic view of Vestrahorn Mountain range reflecting in shallows of black volcanic beach, Stokksnes, South Iceland, Polar Regions

Winter sunset on black volcanic sand beach looking towards rock stacks of Reynisdrangar, Vik, South Iceland, Polar Regions

Penstemon flowers, Mount St. Helens, Mount St. Helens National Volcanic Monument, Washington state, United States of America, North America

Icebergs at sunrise on Jokulsarlon Beach, a black volcanic sand beach in South East Iceland, Iceland, Polar Regions

Cruise ship anchoring in the volcanic crater of Deception Island, South Shetland Islands, Antarctica, Polar Regions

Volcanic boulders on Navajo sandstone, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

View of the mountains of Vestrahorn from black volcanic sand beach at sunset, Stokksnes, South Iceland, Iceland, Polar Regions

Volcanic ash (tephra) crater Hverfjall (Hverfell), 140m deep, more than 1 km across, at Myvatn, northern Iceland, Iceland, Polar Regions

Coloured rocks at the volcanic crater, Deception Island, South Shetland Islands, Antarctica, Polar Regions

Fishing boat on Lake Toba (Danau Toba), the largest volcanic lake in the world, North Sumatra, Indonesia, Southeast Asia, Asia

Petrohue Falls and Osorno Volcano, Vicente Perez Rosales National Park, Chilean Lake District, Chile, South America

Glassy pieces of ice on volcanic black sand beach at sunrise, near Jokulsarlon Lagoon, South Iceland, Polar Regions

Glassy pieces of ice on volcanic black sand beach at sunrise, near Jokulsarlon Lagoon, South Iceland, Polar Regions

Mt Ngauruhoe volcano, beyond Red Crater, in the Tongariro National Park, Taupo, North Island, New Zealand

Glassy pieces of ice on volcanic black sand beach at sunrise, near Jokulsarlon Lagoon, South Iceland, Polar Regions

Glassy pieces of ice on volcanic black sand beach at sunrise, near Jokulsarlon Lagoon, South Iceland, Polar Regions

Glassy pieces of ice on volcanic black sand beach at sunrise, near Jokulsarlon Lagoon, South Iceland, Polar Regions

Looking towards the sea stacks of Reynisdrangar at sunset from the black volcanic sand beach at Vik i Myrdal, South Iceland, Iceland, Polar Regions

Mount St. Helens, Mount St. Helens National Volcanic Monument, Washington state, United States of America, North America

Iceberg at sunrise on Jokulsarlon Beach, a black volcanic sand beach in South East Iceland, Iceland, Polar Regions

Icebergs on a black sand volcanic beach next to the Jokulsarlon glacial lake in Vatnajokull National Park in southeast Iceland, Polar Regions

Aerial of Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Icebergs at sunrise on Jokulsarlon Beach, a black volcanic sand beach in South East Iceland, Iceland, Polar Regions

Ice shelfs at the entrance of the volcanic island of Deception Island, South Shetland Islands, Antarctica, Polar Regions

Glassy pieces of ice on volcanic black sand beach with blurred waves, near Jokulsarlon Lagoon, South Iceland, Polar Regions

Eruptions at the Monti Calcarazzi fissure and the Piano del Lago cone, above, on Mount Etna that threatened tourist facilities and villages in 2001, Sicily, Italy, Europe

Mt Ngauruhoe, 2291m, youngest of the three volcanoes in the Tongariro National Park, North Island, New Zealand

Aerial view, Volcano in Parque Natural de los Volcanes, Timanfaya, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Mountain road crossing the volcanic landscape near Sicasumbre astronomical viewpoint, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Mountain road crossing the volcanic landscape near Sicasumbre astronomical viewpoint, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Aerial view of El Golfo village and the volcanic landscape of Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Hot pools and boiling mud at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions

Panoramic view of tufa formations, Devrent Valley (Pink Valley), near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Hikers, volcanic scenery and hiking trail, Kirishima National Park, Kagoshima prefecture, Kyushu, Japan, Asia

Caldera Colorado, volcanic landscape, Parque Nacional de Timanfaya, Lanzarote, Canary Islands, Spain, Europe

Exterior of old windmill in volcanic landscape, near Tiscamanita, Fuerteventura, Canary Islands, Spain, Europe

Mountain road crossing the volcanic landscape near Sicasumbre astronomical viewpoint, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Looking towards the sea stacks of Reynisdrangar at sunrise from the black volcanic sand beach at Vik i Myrdal, South Iceland, Polar Regions

Mountain road crossing the volcanic landscape near Sicasumbre astronomical viewpoint, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Aerial view of El Golfo village and the volcanic landscape of Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Mount Teide (Pico del Teide) from the south east outside Parador, Parque Nacional de Las Canadas del Teide (Teide National Park), Tenerife, Canary Islands, Spain, Europe

Traditional windmill and volcanic landscape, Tiagua, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Mountain road crossing the volcanic landscape near Sicasumbre astronomical viewpoint, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Pinnacle Rock, a volcanic plug on Bartolome Island, one of the most spectacular features of the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Bartolome Island with Pinnacle Rock, a volcanic plug, to the right, the location featured in the 2003 film Master and Commander, Galapagos islands, UNESCO World Heritage Site, Ecuador, South America

Haleakala National Park, volcanic landscape, Maui Island, Hawaii, United States of America, North America

Haleakala National Park, volcanic landscape, Maui Island, Hawaii, United States of America, North America

Haleakala National Park, volcanic landscape, Maui Island, Hawaii, United States of America, North America

Haleakala National Park, volcanic landscape, Maui Island, Hawaii, United States of America, North America

Volcanic landscape, Hawaii silversword (Argyroxiphium sandwicense) endemic, Haleakala National Park, Maui Island, Hawaii, United States of America, North America

Volcanic landscape, Hawaii silversword (Argyroxiphium sandwicense) endemic, Haleakala National Park, Maui Island, Hawaii, United States of America, North America

Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia

Hot volcanic steam rising into monsoon clouds from Kawah Ratu (Queen's Crater) of Mount Tangkuban, Perahu, Bandung, Java, Indonesia, Southeast Asia, Asia

View over Roque Bentayga to Teide on Tenerife, Gran Canaria, Canary Islands, Spain, Atlantic, Europe

Aerial view taken by drone of Skyggnisvtn lake in Landmannalaugar area, during a summer day, Iceland, Polar Regions

Playa Caleta Larga, Cabo San Antonio, Guanahacabibes Peninsula National Park and Biosphere Reserve, Pinar del Rio, Cuba, West Indies, Caribbean, Central America

Layers of lava flows and tuff from the dormant volcano on Isla Tortuga, Baja California, Sea of Cortez, Mexico, North America

Aerial view of hot air balloon over rock formations in Love Valley at sunrise, Goreme, Goreme Historical National Park, UNESCO World Heritage Site, Cappadocia, Central Anatolia Region, Anatolia, Turkey, Asia Minor, Asia