Earth Science World
American Geological Institute resources for teachers and students : image bank, book center and geoscience careers
http://www.earthscienceworld.org/

CIESIN
CIESIN works at the intersection of the social, natural, and information sciences, and specializes in on-line data and information management, spatial data integration and training.
http://www.ciesin.columbia.edu/

earth science australia
Earth science site from Australia : information, images, animations and links.
http://earthsci.org/