Europe's most active volcano, Mount Etna, has always been a geological puzzle. The Sicilian volcano has erupted several times a year, and glassy peaks of over 3,000 meters (10,000 feet) have fascinated scientists for decades. Though renowned, Etna has stubbornly defied categorization in the traditional volcano lifecycle. Continue Reading Category: Physics , Science , Refractor: Science & Health Tags: volcano , Geology , Earth , Italy