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/
Popular Science http://www.popsci.com
Chemistry Help http://www.chem4kids.com/index.html
Biology Help http://www.biology4kids.com/
Geography Help http://www.geography4kids.com/
Astronomy Help http://www.cosmos4kids.com/
Physics Help http://www.physics4kids.com
Chemicool http://www.chemicool.com/
Astronomy Picture of the Day http://antwrp.gsfc.nasa.gov/apod/archivepix.html
Discover Magazine http://discovermagazine.com/
Hubble Space Telescope http://hubblesite.org/
Chemical Elements http://www.chemicalelements.com/
6th Grade Textbook Resources http://www.harcourtschool.com/menus/science2009/grade6_nl.html
Department of Energy http://www.energy.gov/energysources/index.htm
EIA Kids Page http://www.eia.doe.gov/kids/energyfacts/index.html
Kids Point http://www.kidspoint.org/columns2.asp?column_id=664&column_type=homework
Just For Kids Energy http://www.depweb.state.pa.us/justforkids/cwp/view.asp?a=3&q=464796&justforkidsNav=|
Wikipedia http://en.wikipedia.org/wiki/Main_Page
8th Grade Online Textbook http://my.hrw.com/
Mixtures Lab