This leads you to collections of sites about specific geology-related topics like Desert Geology, Gemology, Geographic Information Systems (GIS), Glaciology, Mineralogy, Plate Tectonics, and Volcanology to name a few. (Maintained by Yahoo.)

Part of the Resouce Discovery Network (RDN), a British portal to high-quality academic information, the Earth Sciences Gateway provides acaemic information on Geology, Vocanology and many other earth sciences.