Earth Materials and History
Here are some links to help supplement the 3rd grade Earth Materials kit as well as 6th and 9th grade Earth History…
Please let us know if they were useful 
Plate Tectonics (Grade 9)
Earth Guide : An interactive and easy-to-use educational resource about Earth, oceans and the environment.
Explore the World of Earth Science
Rock Hounds – Explore How Rocks are Formed
