Become a Rock Detective http://www.rockdetective.org/
A program based on classroom-tested earth science mysteries; large kit of rocks, fossils and minerals; step-by-step instructions; for science- or non-science oriented K-12 teachers.
Earth Science Week http://www.earthsciweek.org/
Earth science education event in October of each year. Web site features educational activities, geology questions and answers, and links to other geologic education resources.
This Dynamic Earth http://pubs.usgs.gov/publications/text/dynamic.html
Online version of a U.S. Geological Survey brochure on the topic of plate tectonics. The site seems appropriate for high-schoolers and above (and advanced middle schoolers). Covers the historical development of plate tectonics as a theory, how we see it in action today, and how tectonics affects people.
Virtual Silurian Reef http://www.mpm.edu/reef/intro.html
A K-12 distance-learning project of the Geology Section of the Milwaukee Public Museum. During the Silurian Period in earth history, 425 million years ago, when much of North America was covered by a shallow, tropical sea, reefs flourished in the area now occupied by Wisconsin and Illinois.
