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Across 1. a wave that moves that moves the medium in a direction parallel to the direction in which the wave travels 5. a wave that requires a medium through which to travel 11. the material through which a wave travels 16. a transverse seismic wave 17. the highest part of the transverse wave 19. the interference that occurs when waves combine to make a wave with a larger amplitude 22. a wave produced by an earthquake 23. the bouncing back of an object or wave when it hits a surface through which it cannot pass 26. the interaction between two waves the meet 28. the lowest part of the transverse wave 29. a combination of a longitudinal wave and a transverse wave that travels along the surface of a medium 30. a point of maximum amplitude on a standing wave 31. unit of measurement for frequency 32. the ability to do work

Down 2. the interference that occurs when two waves combine to make a wave with a smaller amplitude 3. the rule that the angle of reflection equals the angle of incidence 4. the distance between two corresponding parts of a wave 6. a point of zero amplitude on a standing wave 7. the part of a longitudinal wave where the particles of the medium are closer together 8. the bending of waves as they move around a barrier or pass through an opening 9. the part of a longitudinal wave where the particles of the medium are far apart 10. a wave that moves the medium in a direction perpendicular to the direction in which the wave travels 12. a disturbance that transfers energy from place to place 13. the bending of waves as they enter a new medium at an angle 14. the maximum distance the particle of a medium move away from their rest positions as a wave passes through the medium 15. a wave that appears to be standing in one place but it is really two waves interfering as they pass through each other 18. the increase of amplitude of a vibration that occurs when external vibrations match an object's natural frequency 20. an instrument used to detect and measure earthquake waves 21. a repeated back and forth or up and down motion 24. the number of complete waves that pass a given point in a certain amount of time 25. a longitudinal seismic wave 27. a huge surface wave on the ocean caused by an underwater earthquake