Where to begin... For all Earth Science activities, always consider using the databases in iCONN, specifically the Discovering Collection and EBSCO's Science Reference Center. Next, try using some of the outstanding subject directories on the Internet, specifically  Librarian's Internet Index and Intute. Some of the finest Internet links are InternetGeography , the USGS and  NOAA.
Plate Tectonics Links Plate Tectonics.com University of California-Berkeley Center for Educational Technologies Wikipedia's article on Plate Tectonics-scroll down to the links at the end. Geology.com About.com's Geology Page The Face of Connecticut	Earthquake-Specific Links Scholastic.com-Interactive Earthquake Model Southern California Integrated GPS Network Cornell University National Geographic University of Nevada-Seismology Lab Virtual Earthquake FAQs from the USGS NOAA's Earthquake Quiz How Stuff Works
Volcano-Specific Links Learner.org Why Files USGS.gov How Stuff Works Center for Educational Technologies Geo Topics @ GeoNet Michigan Technological University