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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.
Why does deposition occur at certain places along the coast? Deposition happens at certain places where waves have lost their  energy. Waves with high energy pick up material and carry it along  wih them. As waves lose their energy, tâ¦hem drop the eroded  material. This hapens when the wave has either lost energy due to  the distance travelled or met a conflicting current or a beach  where the material will be deposited. Tyenna Graham.