This informative book has been newly revised in light of the massive eruption in Iceland in March 2010. The skies over a large part of the world were filled with volcanic ash, affecting weather and agriculture and disrupting travel for millions of people for several weeks. Some of history's greatest recorded disasters involved the spewing magma or falling ash from an erupting volcano. This book takes readers deep under the earth to the source of a volcano's power and then around the world to some of the most spectacular eruptions in history. Volcano Alert! also includes: a) the dangers of lava and pyroclastic surges ; b) a look at the scientific tools volcanologists use to predict and measure eruptions ; and c) famous volcanoes such as Mount Etna, Mount Vesuvius, and Mount Pinatubo.