Fossils http://www.bbc.co.uk/sn/prehistoric_life/games/skeleton_jigsaw/
Rocks and Minerals http://www.surfnetkids.com/games/rocks-ws.htm
Minerals http://www.sdnhm.org/kids/minerals/index.html
Solar System http://www.kidsastronomy.com/solar_system.htm
Solar System http://www.frontiernet.net/~kidpower/planets.html
Solar System http://kids.nineplanets.org/intro.htm