Check out this table-top seismology demonstration . It could be used for a science fair project or for a classroom demonstration. This gives instructions for making a working tectonic model from a shoe box. Make Your Own Paper Model of a Volcano and view QuickTime animations of an eruption.
Record changes in the Earth's magnetic field with a homemade magnetometer .
There is information about earthquakes, magnitudes, Alaskan seismicity, and other topics of earth-shaking interest on my web site in Fairbanks, Alaska . If you live near Denver, CO, visit the USGS Earth Science Information Center in Lakewood for lots of great publications and maps, some free, and to see the new public display area there.