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

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

Lava and ash floes in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

Super Panorama of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona. Created by stitching 5 photos together.

Moai in the Rano Raraku volcanic crater formed of consolidated ash (tuf), Easter Island, UNESCO World Heritage Site, Chile, South America

Moai in the Rano Raraku volcanic crater formed of consolidated ash (tuf), Easter Island, UNESCO World Heritage Site, Chile, South America

Moai in the Rano Raraku volcanic crater formed of consolidated ash (tuf), Easter Island, UNESCO World Heritage Site, Chile, South America

Maoi in the Rano Raraku volcanic crater formed of consolidated ash (tuf), Easter Island, UNESCO World Heritage Site, Chile, South America

Moai in the Rano Raraku volcanic crater formed of consolidated ash (tuf), Easter Island, UNESCO World Heritage Site, Chile, South America

Moai in the Rano Raraku volcanic crater formed of consolidated ash (tuf), Easter Island, UNESCO World Heritage Site, Chile, South America

Grabrok volcanic crater caused by a fissure eruption in Western Iceland near Reykholt, Iceland, Polar Regions

Aerial view of Mt. Kilimanjaro 19335 ft or 5895 m, Reusch crater with ash cone and pit, Tanzania, Africa

Aerial view of Mt. Kilimanjaro 19335 ft. or 5895 m, crater floor with ash cone and pit, Southern Ice field in the foreground, Tanzania, Africa

Hawaii, Big Island, Hawaii Volcanoes National Park, Kilauea, Pu'u O'o eruption, close-up fountaining action

volcanic eruption fiery column and smoke over volcano crater night shot long exposure Eyjafjallajokull April 2010 Fimmvorduhals South Iceland Iceland Europe