03 Dec 2015, Catania, Catania Province, Sicily, Italy, Italy — Catania, Italy. 3rd December 2015 — A so-called dirty thunderstorm with volcanic lightning seen as Mount Etna erupts. The weather phenomenon is related to the production of lightning in a volcanic plume. The image was captured by merging five separate images in sequence. — Explosions and ash emissions were seen from Mount Etna’s Voragine crater. The Voragine was formed inside the volcano’s central crater in 1945. Its last eruptive activity dates back to 2013. — Image by © Marco Restivo/Demotix/Corbis