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Across 1. Measured change over a single period 5. A wave of energy that travels through earths layers. (2 Words) 7. Superposition of two or more waves resulting in a new wave pattern. 9. Number of occurrences of a repeating event per unit of time 10. Motion of a wave throughout a medium or the transfer of its energy 11. Refers to the various phenomena which occur when a wave encounters an obstacle 15. The section of a wave that rises above an undisturbed position 17. Duration of one cycle in a repeating event 18. Initial angle of sinusoidal function at its orgin 19. Distance over which the waves shape repeats 20. Point where the amplitude is at the maximum

Down 2. Ex: a car sounds high pitched when coming towards you and low pitched going away from you 3. Repeating variation 4. Wave property (2 Words) 6. Change in direction to which the wavefront returns to the medium which it originated 8. Reduction of an items density the opposite of compression 12. Change in direction of the wave due to a change in its medium 13. Point along a standing wave where the wave has a minimal amplitude 14. Tendency of a system to oscillate with greater amplitude at same frequencies than other 16. Lowest point in the wave