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I tried to make this better, some images would go a long way! Human 19:50, 28 April 2007 (EDT)

user:Matteeneutra, why is this:

"An earthquake is (usually) a longitudinal wave in the surface of the earth, and while the motion back and forth can be measured, their strength is usually expressed on the Richter Scale."

not "Not to do with subject matter"? An earthquake is a wave, and the Richter scale measures its amplitude. Human 21:31, 10 May 2007 (EDT)