Here is a special thanks to all of these sources:
Books
1. Berret, Norman. Volcanoes, London, Franklin Watts, 1989
2. Challand, Helen J. Volcanoes, Chicago, Childrens Press, 1983
3. Flower, Martin. Volcanoes & Earthquakes, Lincolnwood, HTS Books,1992
4. Harris, Susan. Volcanoes, New York, Franklin Watts, 1979
5. Marcus, Rebecca. Volcanoes & Earthquakes, New York, Franklin Watts, 1963
Electronic Sources
1. Picture of Mt. Saint Helens at http://www.halcyon.com/eeaw/DemGuide/dem.html,
From "Norm and Judy Sohl" , email message.
2. Animation of Mt. Vesuvius at http://tribeca.ios.com/~dobran/HPrest.html,
From dobran@idt.net (Flavio Dobran), email message.
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