Earth Science WWW Resources

I started maintaining lists of Earth Science resources in about 1996, when the Web was fairly young. It's a lot easier today to find resources, and a lot harder for a compiler to keep track of them, so I've given up any attempt to provide a comprehensive coverage. Nevertheless, here are a few pointers to resources I've found useful in certain subject areas. In many cases they are links to other people's lists of links.

General Earth Sci
Mineralogy Links
Petrology Links
Teaching Links