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Third crater, created in 1994 and containing green lake, Irazu Volcano, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America

Gorely volcano, tundra plants on slopes, summit crater rims on skyline, Kamchatka, East Siberia, Russia

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

Steam plume from active vent beside crater lake, Volcan Poas, Cordillera Central, Costa Rica, Central America

Late winter hikers on snowfield in South Crater on Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, South Auckland, North Island, New Zealand, Pacific

Backlit image of workers loaded with sulphur pieces cut out from a sulphur mine on Ijen crater lake, Java, Indonesia, Southeast Asia, Asia

Crater Lake and Wizard Island at dawn, Crater Lake National Park, Oregon, United States of America, North America

Aerial of a tuquoise crater lake on top of Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Sulphur crystals on fumarole at Papandayan Volcano an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Sulphur encrusted fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Sulphur encrusted fumarole at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Green crater lake and steaming fumaroles at Papandayan Volcano, an active four cratered caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Mineral stained pond on collapsed flank of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

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

Glowing active volcanic crater of Volcan Telica on a starry night, with the Milky Way, Orion and the Pleiades, Leon, Nicaragua, Central America

Glowing active 700m wide volcanic crater of Volcan Telica with lava vents far below, in the North West volcanic chain, Leon, Nicaragua, Central America

Smoking 700m wide crater of Volcan Telica in the North West volcano chain, one of the country's most active volcanoes, Leon, Nicaragua, Central America

Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Smoke rises from the active crater of Tungurahua Volcano that threatens the nearby town of Banos, Ambato Province, Central Highlands, Ecuador, South America

Cape buffalo (African buffalo) (Syncerus caffer) with a red-billed oxpecker (Buphagus erythrorhynchus), Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania,East Africa,Africa

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

Tourists looking into the crater and view from the rim into the crater of Ranu Kau, Rapa Nui (Easter Island), Chile, South America

Steam plume from rising dome within crater, Mount St. Helens, Washington state, United States of America, North America

Shores of Lake Myvatn at dusk, fine pseudo-crater in the distance, near Skutustadir, Myvatn, northern area, Iceland, Polar Regions

Aerial view of Mount Visoke (Mount Bisoke), an extinct volcano straddling the border of Rwanda and Democratic Republic of the Congo (DRC) showing crater lake, with Mount Mikeno in background, Virunga Volcanoes, Great Rift Valley, Africa

Grey crowned crane (Southern crowned crane) (Balearica regulorum) pair in flight, Ngorongoro Crater, Tanzania, East Africa, Africa

African hoopoe (Upupa africana) with its crest erected, Ngorongoro Crater, Tanzania, East Africa, Africa

Spotted Hyena or Spotted Hyaena (Crocuta crocuta) at a Cape Buffalo kill, Ngorongoro Crater, Tanzania

Young vervet monkey (Chlorocebus aethiops) climbing a tree, Ngorongoro Crater, Tanzania, East Africa, Africa

Two black rhinoceros (hook-lipped rhinoceros) (Diceros bicornis), Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Cape buffalo (African buffalo) (Syncerus caffer) and two yellow-billed oxpeckers (Buphagus africanus), Ngorongoro Crater, Tanzania, East Africa, Africa

Cape Buffalo (African buffalo) (Syncerus caffer), white-naped raven (white-necked raven) (Corvus albicollis) and a yellow-billed oxpecker (Buphagus africanus), Ngorongoro Crater, Tanzania, East Africa, Africa

Rock formations against a clear blue sky with mountains in the background, showcasing natural erosion and geological features in the Teide National Park,UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

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

View of lava fields and snow-capped peaks in the distance, Etna, Sicily, Italy, Mediterranean, Europe

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

Summit of active Volcan San Cristobal, 1745m, in the North West volcano chain, the country's highest volcano, Chinandega, Nicaragua, Central America

Crowned plover (crowned lapwing) (Vanellus coronatus), Ngorongoro Crater, Tanzania, East Africa, Africa

African pipit (grassland pipit) (grassveld pipit) (Anthus cinnamomeus) with a grasshopper, Ngorongoro Crater, Tanzania, East Africa, Africa

Male saddle-billed stork (Ephippiorhynchus senegalensis), Ngorongoro Crater, Tanzania, East Africa, Africa

Glowing active volcanic crater of Volcan Telica at night with star trails and shooting star (meteor) on right, Leon, Nicaragua, Central America

Sulphur worker appearing out of toxic fumes at Kawah Ijen, East Java, Indonesia, Southeast Asia, Asia

Sulphur worker mining sulphur at the bottom of the crater, Kawah Ijen, Java, Indonesia, Southeast Asia, Asia

Rice terraces on the slope of the Kawah Ijen (Ijen crater), Banyuwangi, East Java, Indonesia, Southeast Asia, Asia

Crater of Poas Volcano in Poas Volcano National Park, in the Cordillera Central mountain range of Costa Rica, Central America

Crater of Poas Volcano in Poas Volcano National Park, in the Cordillera Central mountain range of Costa Rica, Central America

Geologists taking mineral samples on Gran Cratere (The Great Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Saddle-billed stork (Ephippiorhynchus senegalensis), Ngorongoro Crater, Tanzania, East Africa, Africa

Caracal (Caracal caracal) with a young Thomson's Gazelle (Gazella thomsonii), Ngorongoro Crater, Tanzania, East Africa, Africa

Olive Baboon (Papio cynocephalus anubis) juvenile grooming an adult male, Ngorongoro Crater, Tanzania, East Africa, Africa

Grey crowned crane (Southern crowned crane) (Balearica regulorum), Ngorongoro Crater, Tanzania, East Africa, Africa

Warthog (Phacochoerus aethiopicus) adult and piglet, Ngorongoro Crater, Tanzania, East Africa, Africa

Blue wildebeest (brindled gnu) (Connochaetes taurinus) calf, Ngorongoro Crater, Tanzania, East Africa, Africa

Red-billed oxpecker (Buphagus erythrorhynchus) on a Cape buffalo (Syncerus caffer), Ngorongoro Crater, Tanzania, East Africa, Africa

Cape buffalo (African buffalo) (Syncerus caffer) cow and calf, Ngorongoro Crater, Tanzania, East Africa, Africa

Common zebra (plains zebra) (Burchell's zebra) (Equus burchelli) mare and just-born foal, Ngorongoro Crater, Tanzania, East Africa, Africa

Vervet monkey (Chlorocebus aethiops) mother nursing her infant, Ngorongoro Crater, Tanzania, East Africa, Africa

Lion (Panthera leo), two cubs playing with their mother, Ngorongoro Crater, Tanzania, East Africa, Africa

Tourists on a game drive and a lion (Panthera leo), Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Aerial view of Hnausapollur (Blahylur), a volcanic crater near Landmannalaugar, Fjallabak Nature Reserve, Southern Region, Iceland, Polar Regions

Haleakala Crater, in Haleakala National Park, Maui's dormant volcano, Hawaii, United States of America, Pacific, North America

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

Japanese warning sign on the crater rim of Mount Naka active volcano, Mount Aso, Kyushu, Japan, Asia

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

Volcano crater and black volcanic farmland soil, near Tinajo, Lanzarote, Canary Islands, Spain, Atlantic, Europe