Milan Radisics / Aerial shot of rootless cones or pseudocraters, formed by steam explosions as flowing hot lava crosses over a wet surface, South Iceland, August 2018.

Morley Read / Aerial timelapse rising over misty cloudforest covering the slopes of Sumaco Volcano, with a water filled crater lake in foreground, Napo Province, Ecuador, 2018. (non-ex)

Derek Galon / High altitude Boeri Lake in old volcano crater, Morne Trois Pitons National Park, Dominica, West Indies, Windward Islands.

Vincent Grafhorst / Minden / Crater of active volcano at twilight, Erta Ale, Danakil Depression, Ethiopia

Ingo Arndt / Clouds capping volcano crater, Parc des Volcans, Rwanda

Vincent Grafhorst / Man looking into crater at night, Mount Nyiragongo, Virunga National Park, Democratic Republic of the Congo

Vincent Grafhorst / Lava in volcanic crater, Mount Nyiragongo, Virunga National Park, Democratic Republic of the Congo

Enrique Lopez-Tapia / Travelers watching lava on Erta Ale volcano crater. Afar Region, Ethiopia, Africa. November 2014.

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Steam rising from the crater of Nyiragongo Volcano. Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Pal Hermansen / Aerial view of crater lake in snowy mountain, near Landmannalaugar, Iceland, June 2014.