Gas vents from Kilauea Volcano in Hawaii
Photo courtesy USGS
Volcanoes vary a great deal in their destructive power. [ Some volcanoes explode violently, destroying everything in a mile radius within minutes, while other volcanoes seep out lava so slowly that you can safely walk all around them. The severity of the eruption depends mostly on the composition of the magma.
The first question to address is: why does the ... (More)