Geologic Principles and Plate Tectonics
Content Resources for the Pre-Service Educator

This Dynamic Earth (Jacquelyne Kious and Robert Tilling, USGS)
Good online overview of plate tectonics, history, and people involved in the process.  Goes into moderate detail of processes for older students.

Online Seminars on Science (American Museum of Natural History)
Explore the geological events that shaped our planet over millions of years, and consider the interconnected systems that cause earthquakes, volcanos, and major climate changes. Available for credit.