Each level explores its subject, giving background information and hands on activities. The Science Education Gateway provides teachers with teaching materials dealing with Earth, space, the sun, weather, light, cycles, or the Solar System. A very exciting site that offers online lesson plans and classroom activities for immediate use. USGS has put together a very interesting site looking closely at global change, maps, and Earth science. Different grade levels are offered different activities and information.
Teachers can even access their own online guide.
Volcano World is a NASA sponsored site that spans every facet of volcanoes imaginable. This site is set up for immediate use in the classroom. WhaleNet focuses on whales and marine research. It is sponsored by Wheelock College in Boston Massachusetts with support from the National Science Foundation. This site offers information for students, teachers, and the public.