January 22, 2011 - Lava Lake in bottom of summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.

January 22, 2011 - Lava Lake with small lava fountains, Nyiragongo Volcano, Democratic Republic of the Congo.

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.

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.

Main open-pit copper-sulphur mine at Rio Tinto, Huelva, Southwest Spain, Europe

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

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, Reusch Crater and ash pit, Tanzania, Africa

Full Moon Over Halemaumau Crater Within The Much Larger Summit Caldera Of Kilauea In Hawaii Volcanoes National Park, Steaming Vents In Foreground, Mauna Loa Mountain In Background, Island Of Hawaii, Hawaii, United States Of America

Hawaii, United States Of America; Halema'uma'u Vent Inside Kilauea Crater Glows From Molten Lava At Night With Star Field In The Sky