Understanding Plate Motions http://pubs.usgs.gov/publications/text/understanding.html#anchor3617237 Explains the four types of plate boundaries and gives illustrations and examples of each type from around the world. The 1906 San Francisco Earthquake and fire http://bancroft.berkeley.edu/collections/earthquakeandfire/ Thousands of images and text commemorating the 100th anniversary of the great San Francisco earthquake and fire.  (Feb 2006, LII) See also:  http://public.sd38.bc.ca/~mcmathlib/Disasters Created and maintained by Ms. B. Knoepfel  (Teacher-Librarian), McMath Secondary School.   Updated March 2007.