Why scientists are excited about Italy's volcanoes

The top of the volcano exploded, sending a gigantic column of ash four or five kilometres (2.5-3 miles) into the sky. Mount Stromboli, off the north coast of Sicily, is one of the most active volcanoes in the world. On 11 July, it produced a paroxysm – a type of powerful eruption that interrupts a period of milder volcanic activity. In the village...