NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
http://www.sciencedaily.com
http://www.geology.com
http://www.extremescience.com
htttp://www.yahooligans.yahoo.com/Science_and _Nature
http://www.enchantedlearning.com
http://www.geocities.com/enchantedforest/tower/1217/third3.html
http://www.nasa.cov/home/ (Go to NASA kids for more info)
http://www.discovery.com
http;//nationalgeographic.com
http://si.edu/nsre