I promised to do a quick screencast showing what we demoed to one of our Geology profs for using Google Earth to help teach geology (specifically, plate tectonics). Here's a really quick runthrough, using some of the awesome Google Earth add-on layers provided by the San Diego State University College of Sciences.
I should warn, though, that since I am not a geologist (I don't even play one on TV) and since it's first thing in the morning, I do get some stuff mixed up. Just cringe, push through it, and look at the bigger picture - an interactive 3D geology simulation powered by Google Earth and freely available information.
The video is available in small H.264 format,which will work fine in iTunes and on iPods. It's also available in original large H.264 format and MPEG4.