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Aerial view of Ngorongoro Crater in the Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Aerial view of Ngorongoro Crater in the Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Exploring a volcanic landscape on a footpath up Saxholl cinder cone and crater, Snaefellsjokull National Park, western Iceland, Polar Regions

People walking on Gran Cratere rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Salt workers near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Daniel Campos Province, Bolivia, South America

The salt flats near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Daniel Campos Province, Bolivia, South America

The salt flats near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Daniel Campos Province, Bolivia, South America

The salt flats near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Daniel Campos Province, Bolivia, South America

The salt flats near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Daniel Campos Province, Bolivia, South America

The salt flats near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Daniel Campos Province, Bolivia, South America

The salt flats near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Daniel Campos Province, Bolivia, South America

Llamas (Lama glama), feeding near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Bolivia, South America

Llamas (Lama glama), feeding near Coqueza, a small town near the Thunupa Volcano, Salar de Uyuni, Bolivia, South America

View over the volcanic landscape of Parque Natural de Los Volcanes, La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Volcanic coastline with waves crashing into sea caves, Los Hervideros, Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic, Europe

View of Mount Rainier, a stratovolcano in the Cascade Range of the Pacific Northwest, located in Mount Rainier National Park, Washington State, United States of America, North America

The remains of old water boats at Deception Island, an active volcano which last erupted in 1969, Antarctica, Polar Regions

A view of Candlemas Island, an uninhabited volcanic Island in the South Sandwich Islands, South Atlantic, Polar Regions

A view of Lucifer Hill on Candlemas Island, an uninhabited volcanic Island in the South Sandwich Islands, South Atlantic, Polar Regions

A view of Leskov Island, a volcanic island in the South Sandwich Islands, South Atlantic, Polar Regions

Majestic crater of Hondo volcano (Calderon Hondo) with the ocean in background, Corralejo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Lovely Mahoro Island beach with Masare and Karangetang volcano beyond, Mahoro, Siau, Sangihe Archipelago, North Sulawesi, Indonesia, Southeast Asia, Asia

Volcanic cinder cones in Cinque Picos caldera, seen from Serra do Cume, Terceira island, Azores, Portugal, Atlantic, Europe

Serro do Cume shield volcano, and city of Praia da Vitoria, Terceira island, Azores, Portugal, Atlantic, Europe

Sulphur smoke atop this active 1784m Pacific Ring of Fire volcano. Mount Karangetang, Siau, Sangihe Islands, Sulawesi, Indonesia

Pickers bagging cabbages grown on fertile volcanic soil near Mount Mahawu, an active volcano near Tomohon city, Gunung Mahawu, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Walker on an old lava flow, now a smooth eroded river bed and hiking trail to Lokon volcano, near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Aerial view of Caldera Colorada, Tinajo, Las Palmas, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Panoramic view, crater of Blue Lake and Tongariro Volcano at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

The verdant slopes of the active Tungurahua Volcano that threatens the nearby town of Banos, Ambato Province, Central Highlands, Ecuador, South America

Tourists on Volcan Poas, the Active Crater of 2704m set in it's own National Park, Alajuela Province, Costa Rica

Watering place on the Argitchi plateau, Armaghan volcano in the background, Gegharkunik region, Armenia, Eurasia

Aerial view of the eruption area near to Reykjavik, Icelandic southern coast, Iceland, Polar Regions

Aerial vertical view of old volcano and asphalt road, near to Myvatn lake on a summer day, Iceland, Polar Regions

Aerial view taken by drone of little volcano in Landmannalaugar area on a summer day, Iceland, Polar Regions

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

Chachani volcano rising above Santa Catalina Monastery, UNESCO World Heritage Site, Arequipa, Peru, South America

Vibrant sunrise at Five-storey pagoda, Chureito Pagoda, overlooking Fujiyoshida City and Mount Fuji volcano, Fujiyoshida, Honshu, Japan, Asia

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Forest slopes in front of the summit, Mount Fujiyama (Mount Fuji), UNESCO World Heritage Site, iconic volcano in autumn, Honshu, Japan, Asia

Mount Fujiyama (Mount Fuji), UNESCO World Heritage Site, iconic volcano in autumn with red pagaoda framing the summit, Honshu, Japan, Asia

October 19, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash and steam cloud are blown away by wind. View over industrial area of Kliuchi town with Kamchatka River in foreground.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

October 24, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia, seen in evening light. Ash cloud is produced by the activity. Kamen volcano is seen on right.

October 21, 2013 - Nighttime view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

February 24, 2013 - Mushroom shaped ash cloud produced by powerful explosive eruption of Sakurajima volcano, Kagoshima, Japan.

February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible. Static lightning discharges are visible at top of picture.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. A crater wall separates Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

November 30, 2012 - Glowing Rerombola lava dome of Paluweh (or Rokatenda) volcano during eruption in 2012, Flores, Indonesia.

November 28, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible against blue night sky.

November 27, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.

November 26, 2012 - Powerful explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.

November 26, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.

November 26, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.

January 22, 2012 - Glowing lava in crater illuminating gas cloud above Nyamuragira Volcano, Kimanura Eruption.

January 22, 2012 - Bush silhouetted against glow of lava in crater of Nyamuragira Volcano, Kimanura Eruption.

January 24, 2012 - Incandescent lava bombs expelled during a basaltic fissure eruption on Nyamuragira Volcano, Kimanura Eruption.

November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.

January 21, 2011 - Active 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.

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

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

One of Jeju Island's many lighthouses stands against Mount Sanbangsan and Mount Hallasan, a shield volcano, Jeju Island, South Korea, Asia

Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

Outrigger canoe moored on Kalea Beach with active Karangetang volcano beyond, Kalea, Siau Island, Sangihe Archipelago, North Sulawesi, Indonesia, Southeast Asia, Asia

View of the cone of Gunung Api Wetar volcano from Nailaka island, Banda Islands, Maluku, Spice Islands, Indonesia, Southeast Asia, Asia

Gros Piton, with palm trees and thatched sun umbrellas, Sugar Beach, St. Lucia, Windward Islands, West Indies Caribbean, Central America