How are the waves of an earthquake used to give information about the Earth's interior?

Asked by Dr. John Carmen 13 years ago 12/13/2012 8:15 AM

Last updated by anonymous 13 years ago 12/14/2012 7:28 PM

Answered by Dr. John Carmen 13 years ago 12/14/2012 7:28 PM

If the waves of an earthquake change, then scientists know that there has been a change in the material through which they are traveling.