While reviewing various light sources, the source of colors (white, red, yellow, blue) are also discussed. The bouncing of light, the matching of colors, and seeing colors are all highlighted.

After discussing the basics of the eye, this site explores the various functions of the eye and parts from the optic nerves to the retina. Cones, rods, and the brain are also discussed.

As an overview of the online exhibit on earthquakes, this site discusses the various sections inside the Earth. The crust, the mantle, and the core are each individually discussed.

As an overview of the online exhibit on earthquakes, this site provides brief information on faults and mentions the San Andreas Fault along with a picture.

This site provides information about the Hubble Space Telescope, and its mission into space.