Directories

American Geophysical Union
AGU is an international scientific society of 35,000+ members. AGU homepage has many hyperlinks to earth, oceans, atmosphere, space, and planets. AGU homepage welcomes members of the public, including students and teachers.
http://www.agu.org/

Geo Site
Good starting point for all amateurs interested in Geology (professionals are also welcome). This geological site was the first in Sweden.
http://www.acc.umu.se/~widmark/lwgeolog.html

GeoForum
Internet-based, technical information system. All Internet-based information contained in Geoforum.com is free of charge
http://www.geoforum.com/

Geology.com -- Earth Sciences on the Web
Links to popular topics in Geology and other earth sciences, plus earth sciences journals, and university departments.
http://geology.com/

Geologyone.com
Geoscience news; earth science internet links; directories of earth science software and clipart resources; listings for scientific instruments; dealers of minerals and gemstones.
http://geologynet.com/indexa.htm