National Geographic for Kids http://www.nationalgeographic.com/kids/
SOS Stream study http://people.virginia.edu/~sos-iwla/Stream-Study/StreamStudyHomePage/StreamStudy.HTML
Stream Study - Determining Water Quality http://www.bv229.k12.ks.us/bvnwbiology/fieldbiology/macroinvertebrates/index.htm
Stop Pointless Personal Pollution http://www.epa.gov/owow/nps/nps_edu/pdf/stop.pdf
plastic bags http://www.poconorecord.com/apps/pbcs.dll/article?AID=/20080506/MULTIMEDIA02/80505016
How Stuff Works http://www.howstuffworks.com/
Clouds http://www.weatherwizkids.com/cloud.htm
Science Made Simple http://www.sciencemadesimple.com/science.html
NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
Elements http://www.chemicalelements.com/elements/c.html
Web Elements http://www.webelements.com
Periodic Table of Elements http://www.chemicool.com/
Periodic Table of Elements - another one! http://periodic.lanl.gov/default.htm
EPA Environmental Kid's club http://www.epa.gov/kids/
Try Science http://www.tryscience.com/home.html
Extreme Science http://www.extremescience.com/
Mt. St. Helen eruption http://video.google.com/videoplay?docid=3977416382972126736
Minerals http://www.galleries.com/minerals/by-name.htm
More minerals http://geology.com/minerals/