Grear on line Earth Science Resource

http://www.classzone.com/books/earth_science/terc/navigation/home.cfm

This site by Holt McDougal provides a wealth of activities, simulations, and resources for Earth Science.

Several web resources for simple machines

Here are a number of sites wirh resources related to the concepts of Work, Energy and Simple Machines. Let me know how you like them:

http://sunshine.chpc.utah.edu/javalabs/java12/machine/act1/lab.htm

http://www.teachengineering.com/index.php

http://www.grc.nasa.gov/WWW/K-12/Summer_Training/KaeAvenueES/pulleys.html

pulley activity w/o pulleys

http://edtech.kennesaw.edu/web/simmach.html

many simple machine links

http://tonto.eia.doe.gov/kids/

http://phet.colorado.edu/index.php

The links came out a bit wonky...just click on the blue http part and they should work!!