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Hiking in Diamond Head State Monument (Leahi Crater), Honolulu, Oahu, Hawaii, United States of America, Pacific

Mount St. Helens, with steam plume from rising dome within crater, seen from Johnston Ridge Visitor Centre, Washington state, United States of America, North America

African elephant (Loxodonta africana), Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

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

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

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

Lone Pine Tree in a volcanic valley in Coconino National Forest near Sunset Crater National Monument of Arizona.

Fire Road 546 where it branches off from Sunset Crater National Monument into Coconino National Forest of Arizona.

Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona. Humphrey's Peak is in the background.

Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona. Humphrey's Peak is in the background.

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

Small crater of Formica Leo volcano in caldera Enclos Fouque near Piton de la Fournaise volcano, viewed from Pas de Bellecombe.Reunion island,overseas departement of France,Indian Ocean

Aerial view of smoke above the turquoise lake on crater of Kawah Ijen volcano, Banyuwangi, East Java, Indonesia

Adult male Grant's gazelles (Nanger granti), inside Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Adult male Grant's gazelles (Nanger granti) sparring inside Ngorongoro Crater, Tanzania, East Africa, Africa

Fire Road 546 where it branches off from Sunset Crater National Monument into Coconino National Forest of Arizona.

A burned tree below a volcanic cinder hill in the Coconino National Forest near Sunset Crater National Monument Arizona.

An SUV traveling near Volcanic cinder hills in Coconino National Forest near Sunset Crater National Monument of Arizona.

Thomson's gazelles (Eudorcas thomsonii), in Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Lone Pine Tree in a volcanic valley in Coconino National Forest near Sunset Crater National Monument of Arizona.

Volcanic cinder hill in Coconino National Forest near Sunset Crater National Monument of Arizona with snow capped Humphrey's Peak in the background.

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

February 11, 2008 - Dallol geothermal area, 1926 explosion crater by Black Mountain, 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 of potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

Nubian ibex standing on a mountain in the Ramon crater with a beautiful mountain israeli landscape with blue sky on the background. Negev desert, Israel.

The southeast summit of O'Leary Peak viewed from a volcanic cinder hill in Coconino National Forest near Sunset Crater National Monument of Arizona.

Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona. Humphrey's Peak is in the background.

Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia

Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia

Thomson's gazelle (Gazella thomsonii) female giving birth, Ngorongoro Crater, Tanzania, East Africa, Africa

The fire watchtower on the summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

Forest Service Road that leads to the O'Leary Peak Watchtower and Overlook. Adjacent to Sunset Crater National Monument Arizona in the Coconino National Forest.

A snow squall storm building up over Humphrey's Peak. Viewed from O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to Sunset Crater National Monument.

End of the Forest Service Road that leads to the O'Leary Peak Watchtower and Overlook. The metal grating is to add traction for vehicles. Adjacent to Sunset Crater National Monument Arizona in the Coconino National Forest.

A snow squall storm building up over Humphrey's Peak. Viewed from O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to Sunset Crater National Monument.

Dead trees from a past forest fire on the slope of O'Leary Peak in northern Arizona. Sunset Crater Volcano is in the background.

The eastern summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

African bush elephant (Loxodonta africana), feeding inside Ngorongoro Crater, Tanzania, East Africa, Africa

Looking down into Ubehebe crater, a Maar volcano, caused by groundwater contacting hot magma or lava, Death Valley National Park, California, United States of America, North America

O'Leary Peak viewed from a Volcanic cinder rim slope in Coconino National Forest near Sunset Crater National Monument of Arizona.

Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona.

Smoke over the two craters of Erta Ale volcano summit caldera, Danakil Depression, Afar Region, Ethiopia, Africa

Panoramic aerial view of sunset over the active Erta Ale volcano crater, Danakil Depression, Afar Region, Ethiopia, Africa

Burned trees on a Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona.

Volcanic cinder rim in Coconino National Forest near Sunset Crater National Monument of Arizona. Humphrey's Peak is in the background.

View from Calderon Honda crater of lava rock ruins and volcanic cones of the north, Lajares, Fuerteventura, Canary Islands, Spain, Europe

View from Calderon Honda crater of lava rock ruins and volcanic cones of the north, Lajares, Fuerteventura, Canary Islands, Spain, Europe

Late afternoon light on the Crater Lake of the Crater Lake National Park, Oregon, United States of America, North America

Volcanic landscape of the Masaya caldera, Nicaragua's first national park, with craters and a'a blocky lava, Masaya, Nicaragua, Central America

Adult male Grant's gazelles (Nanger granti) sparring inside Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Green-backed heron (striated heron) (Butorides striatus), immature, Ngorongoro Crater, Tanzania, East Africa, Africa

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

Thomson's gazelle (Gazella thomsonii) buck with reflection, Ngorongoro Crater, Tanzania, East Africa, Africa

Thomson's gazelle (Gazella thomsonii) buck drinking with reflection, Ngorongoro Crater, Tanzania, East Africa, Africa

Serengeti jackal (golden jackal) (Canis aureus bea) pup, Ngorongoro Crater, Tanzania, East Africa, Africa

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

Serengeti jackal (golden jackal) (Canis aureus bea) pups, Ngorongoro Crater, Tanzania, East Africa, Africa

People walking through fumaroles on Volcano Gran crater rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Gran Cratere (The Great Crater) and Aeolian Islands view, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe