ASH PLUME STREAMS FROM MT. ETNA, SICILY. When this photograph
was taken from Space Station Alpha on July 22, 2001, Mt. Etna's ash cloud reached about
5.2 kilometers into the atmosphere. Etna's record of volcanism is one of the longest in
the world, dating back to 1500 BC. Two styles of volcanism are typical: explosive
eruptions from the summit and flows from fissures on the volcano's flanks. (Photo courtesy
of NASA.) Click here to learn more about Italy's
volcanoes. Click here to learn more about
volcanoes all over the world.