Italy's Mount Etna and Mount Stromboli volcanoes erupted in recent days, spewing smoke and ash into the air. These volcanoes are two of the most active in the world — but they are not the only ...

Next is VEI-1, a gentle eruption that can happen frequently. Italy's Mt. Stromboli has been erupting almost continuously for 2,000 years. VEI-2s consist of several mild explosions a month.

It can be seen from nearly every location in Sicily. Its iconic and massive, cone-shaped presence looming over the city of ...