Smoke billows from a crater of Mount Etna volcano, background, seen from Catania, southern Italy, Thursday, March 4, 2021. Mount Etna, the volcano that towers over eastern Sicily, evokes superlatives. It is Europe's most active volcano and also the continent's largest. And the fiery, noisy show of power it puts on for days or weeks, even years every so often, is always super spectacular. (AP Photo/Salvatore Allegra)