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

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

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

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