Jessica FontaineDear Jessica,
The most recent eruption at Vesuvius was from 1913-1944. The volcanologists in Italy are monitoring the volcano and will probably be able to predict the next eruption. Before the next eruption the volcano will swell (like a balloon blowing up) and earthquakes will be caused by magma moving inside the volcano. Volcanologists can detect these changes.
Steve Mattox, University of North Dakota
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