www.chem4kids.com
An easy to understand chemistry site.
www.mathleague.com
Quick answers to math problems for students grades 4 - 8, including these categories: Fraction, Geometry, Integers, and Introduction to Algebra. Although this site's main interest is math contests for kids grades 4 - 12, it also has practice tests, web links, tutorial files and home schooling resources.
www.nasa.gov
National Aeronautics-Space Association's website (NASA). Space exploration updates as well as planet and other space related information.
www.usgs.gov
U.S. Geological Survey web site. Teaches everything from glacier movement, landslides and even mapping.
www.nws.noaa.gov
Web site of the National Weather Service, the government agency in charge of helping people prepare for all types of weather occurrences.