Inside Earth: Core, Mantle, Crust
What’s the inside of the Earth like? How do we know? Read about the planet you live on, and what goes on inside…
http://www.kidsgeo.com/geology-for-kids/0020-crust-mantel-core.php
http://amonline.net.au/geoscience/earth/structure.htm
http://mediatheek.thinkquest.nl/~ll125/en/struct.htm
http://www.seismo.unr.edu/ftp/pub/louie/class/100/interior.html