Open Questions: Earth Science

Open Directory Project: Earth Sciences: Categorized and annotated links. A version of this list is at Google, with entries sorted in "page rank" order. May also be found at Netscape.
The Virtual Library: Earth Science: Categroized, annotated list of links.
Yahoo Earth Sciences Links: Annotated list of links.
Galaxy: Geosciences: Categorized site directory. Entries usually include descriptive annotations.
Galaxy: Earth Science: Categorized site directory. Entries usually include descriptive annotations.
Websurfers Biweekly Earth Science Review (WBESR): A large collection of site reviews and links to more than 3000 Earth science Web sites. A special section is provided for links that may be useful to teachers in grades K-12.

Geologylink: The site is an impressive collection of geology resources, sponsored by Houghton Mifflin Company. Features include news, general external links, links to online courses, and a glossary.
Destination: Earth: Official Web site for NASA's Earth Science Enterprise. Extensive information on all aspects of NASA's Earth sciences programs.
Earth sciences@nature.com: A portal to relevant Nature Publishing Group resouces in the field of earth sciences.

BBC Learning: Nature Websites: Directory to a number of Web sites developed by the BBC on various topics releated to Earth sciences, such as climate change and the environment.

Galaxy: Earth Science Expert Links: Categorized site directory. Entries usually include descriptive annotations.
USGS: Ask-A-Geologist: U. S. Geological Survey page that provides instructions on how to send questions by email for response by a USGS geologist.

MIT OpenCourseWare: Earth, Atmospheric, and Planetary Sciences: Course materials provided by the MIT OpenCourseWare project. New courses are continually added. Detailed lecture notes and additional materials such as problem sets are provided for some, but not all, courses.