interactive site http://www.sheddaquarium.org
National Park Service http://www.nps.gov
Science Museums, Science Fair Project Ideas, Science Education http://.tryscience.org
Exploratorium: the museum of science, art & human perception, San Francisco http://www.exploratorium.edu
Volcano Info http://volcano.und.edu
Environmental Protection Agency http://www.epa.gov
Geography http://www.geography4kids.com
Experiment with time to see how the world changes http://www.playingwithtime.org
American Chemistry http://americanchemistry.com
Biomes, plants, animals, climates http://www.blueplanetbiomes.org
Chemistry - elements http://www.webelements.com
chemistry http://www.chemicool.com
Chemistry - elements http://www.chemicalelement.com
National Aeronautical Space Administration http://www.nasa.gov/audience/forstudents/5-8/features/index.html
National Geographic http://www.nationalgeographic.com
Virtual Microscope bugscope.beckman.uiuc.edu
WebAnatomy, University of Minnesota http:www.msjensen.gen.umn.edu/webanatomy
AStronomy http://www.kidsastronomy.com
National Oceanic & Atmospheric Administration http://www.noaa.gov
U.S. Geological Survey http://www.usgs.gov
World Almanac for Kids http://www.worldalmanacforkids.com
"History through the eyes of those who lived it" by Ibis Corp. http://www.eyewitnesstohistory.com
online Atlas by National Geographic http://plasma.nationalgeographic.com/mapmachine/index.html