'Krakatoa': The Wrath of the Earth By RICHARD ELLIS The cover of "Krakatoa" by Simon Winchester. When a volcano erupts, it can do terrible damage, as Vesuvius did in A.D. 79, burying the cities and inhabitants of Pompeii and Herculaneum. But as the tens of thousands of people now living on its slopes can attest, Vesuvius is still there, and so are most of the world's better-known volcanoes, such as Etna, Rainier, Kilauea, Paricutin and Fujiyama (yes, Fuji is a volcano; it last erupted in 1707). Even Mount St. Helens, the top of which blew off in 1980, is (mostly)...