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Unlike body waves, surface waves (also known as long waves, or simply L waves) move along the surface of the Earth. Surface waves are to blame for most of an earthquake's carnage. They move up and down the surface of the Earth, rocking the foundations of man-made structures. Surface waves are the slowest moving of all waves, which means they arrive the last.
Answers. 1  B. 2 waves overlap. when 2 waves overlap theres a certain region in which both the 2 waves are present. imagine 2 waves moving towards each other, so in between there will be a non moving region consisting of wave of both the incoming waves that is the standing wave and it will disappear after both waves cross each other.