The Electromagnetic Spectrum

There are several websites that are helpful in describing the electromagnetic spectrum. Here are two of them.

http://www.darvill.clara.net/emag/

http://missionscience.nasa.gov/ems/index.html

In the above website there is also a video series that reviews each part of the electromagnetic spectrum. This video series can be found here: http://missionscience.nasa.gov/ems/emsVideo_01intro.html