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 ...

Mount Etna in Sicily, Italy, is an example of a composite volcano. Shield volcanoes do not have such violent eruptions. These volcanoes tend to have gentle slopes and their runnier lava spreads ...