Electromagnetic waves can travel in empty space or space that has no particle.
12. Transverse mechanical waves are waves that travel to an applied force.
13. Longitudinal waves are the same as transverse waves.
14. Surface waves are waves that travel along the boundary between two different media, such as air and water or liquids of different densities.
15. Tsunamis are huge longitudinal waves caused by shifts of tectonic plates.
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