Very rudimentary. The "Classroom Investigations" are for grades 5-8. However it is not uninteresting and includes links to simulations and worksheets. It was created by the National Science Teachers Association. Could be a fun resource to included if for no other reason than because it's cute. The "Galapagos Guide" is within the site, explaining different areas of the islands. The "Resources for Teaching Evolution" tab does not have designated grades and appear to be a little more intensive. It contains things like discovery channel videos and a virtual tour of a volcano.