General Science Resources

Web Elements (http://www.webelements.com/) is the first periodical table of elements on the WWW. Click on any element for more information about it.
It's Elemental: The Periodic Table (http://pubs.acs.org/cen/80th/elements.html) by Chemical & Engineering News, the publication of the American Chemical Society. Click on the element of your choice and get a LOT of great information. A bit more advanced than WebElements.
A Periodic Table of the Elements at Los Alamos National Laboratory (http://periodic.lanl.gov/default.htm) gives vital stats on an element, plus its history, major compounds, and cost. Very nice site.
Exploratorium Snacks (http://www.exploratorium.edu/snacks/) has short, easy to do experiments and projects, arranged by subject.
UN Atlas of the Oceans (http://www.oceanatlas.org/) is a great site that Mrs. Phillips found! Click on the number corresponding to the ecosystem you are studying, and it takes you right to the information you need.