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January 21, 2011 - Small fountains in lava lake, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Active lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Lava rafts floating on lava lake in summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Nighttime view of summit caldera with lava lake, Nyiragongo Volcano, Democratic Republic Congo.

January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.

January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.

May 21, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

May 20, 2008 - Lava bomb trajectories visible during nighttime vulcanian eruption of Anak Krakatau volcano, Sunda Strait, Java, Indonesia.

March 1, 2010 - Sabo channel at Haramatsu River with tubular grid dam (slit dam type), for defense and protection against mudflows, with Sakurajima volcano in background, Japan

December 12, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

December 11, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

December 30, 2007 - Lava is flung high in the air during a nighttime eruption of Fuego volcano, Antigua, Guatemala.

November 2006 - Lava flowing from base of hornito during eruption of Mount Etna volcano, Sicily, Italy.

November 2006 - Boulder rolling in lava flow at dusk during eruption of Mount Etna volcano, Sicily, Italy.

November 2006 - Lava flowing from base of hornito during eruption of Mount Etna volcano, Sicily, Italy.

February 11, 2008 - Dallol geothermal area, 1926 explosion crater by Black Mountain, Danakil Depression, Ethiopia.

February 11, 2008 - Dallol geothermal area, egg-shaped fumarole deposits formed in salt deposits of brine hot springs, Danakil Depression, Ethiopia.

January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.

January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces of potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

Mount Vesuvius behind the ruins of the Roman resort of Herculaneum, destroyed in the eruption of AD 79 which covered the town in lava and mud, Herculaneum, near Naples, Campania, Italy, Europe

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

Birdman petroglyphs at Orongo ceremonial village on rim of crater Rano Kau, offshore lie bird islands of Motu Kao Kao, Motu Iri and Motu Nui, Easter Island, Chile, Pacific

Aerial view over vineyards and black volcanic soil, La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe

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 over vineyards and black volcanic soil, La Geria, Lanzarote, 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

Snow covered frozen Viti (Hell) crater near Krafla power plant, Lake Myvatn, North area, Iceland, Polar Regions

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

Mount Sibayak, 2094m high, an active volcano in the Karo Highlands, North Sumatra, Sumatra, Indonesia, Southeast Asia, 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

Fagradalsfjall volcano, active vent during the eruption of July 2021, Reykjanes Peninsula, Iceland, Polar Regions

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

Sarakiniko volcanic rock formations at sunset, island of Milos, Cyclades, Greek Islands, Greece, Europe

Fog shrouds the volcanic mountains surrounding Cova de Paul on Santo Antao Island, Cape Verde, Africa

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

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

Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

El Tatio Geysers, at 4300m above sea level El Tatio is the world's highest geyser field, the area is ringed by volcanoes and fed by 64 geysers, Atacama Desert, Norte Grande, Chile, 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

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.

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

Pool fitted in the volcanic lava flow, Garachico, village on the North coast, Tenerife, Canary Islands, Spain, Atlantic Ocean, Europe

Roques de Garcia, Caldeira de las Canadas, Mount Teide, Mount Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic Ocean, Europe

Pico Viejo, Caldeira de las Canadas, Mount Teide, Mount Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic Ocean, Europe