rainbowresource.com has a really wonderful science series called: science power basics..they cover chem,physcics,earth&biology and so on.. they are not religious,they are up front and get right to the point they don't tell you alot of nonesense that has nothing to do with the subject at hand, i think they are really great the pictures are clear and vibrant,lots of info in little space and then questions at the end and reviews at end of each unit... my daughter loves them.we are using the earth one this yr..go to the website and type in power basics and it should go right to it or you can browse thro their curriuclums in science. hope this helps.. beckie