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http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html Easily comprehensible information from NASA about radiation and the electromagnetic spectrum which is one types of radiation. Radiation is energy that travels and spreads out as it goes, such as visible light.
http://www.eas.asu.edu/~holbert/wise/electromagnetism.htm Description of electromagnetism and describes the relationship between electricity and magnetism.
http://www.wavegroup.irfu.se/SEE/ A dynamic Simulated Electromagnetic Emissions diagram with graph of typical SEE measurements from ground and from space is a fascinating look at earth based electromagnetic fields.
http://zebu.uoregon.edu/~js/glossary/electromagnetism.html Definition starts with Electromagnetism: Magnetism and electricity are not separate phenomena, they are the related manifestations of an underlying electromagnetic force from University of Oregon glossary.
http://fermi.la.asu.edu/PHY531/introduction Introduction to some basic operations in electromagnetism beginning with some of the basic operations of vector calculus needed for numerical calculations in electromagnetism.
http://www.uh.edu/~rkiehn/ed3/ed3fre9.htm Brief information on the concepts from the fact that classical electromagnetism appear to be formulated in terms of two topological constraints and the importance of potentials.
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