waves and energy

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Across
  1. 2. the distance between a crest or trough of a wave and a line through the center of a wave
  2. 6. the bending of a wave as it crosses the boundary between two mediums at an angle other than 90 degrees
  3. 7. the highest point, or peak, of a wave
  4. 8. the number of wavelengths (or wave crests) that pass a fixed point in a given amount of time, usually one second
  5. 10. wave a type of wave in which the disturbance moves in the same direction that the wave travels
  6. 13. the meeting and combining of waves; the adding or subtracting or wave amplitudes that occurs as waves overlap
  7. 15. the bouncing back of a wave after it strikes a barrier
Down
  1. 1. a disturbance that transfers energy from one place to another without requiring matter to move the entire distance
  2. 3. wave a wave, such as a sound wave or an earthquake wave, that transfers energy through matter
  3. 4. wave a type of wave in which the disturbance moves at right angles, or perpendicular, to the direction in which the wave travels
  4. 5. the distance from one wave crest to the next crest, or from any part of one wave to the identical part on the next wave
  5. 9. the point where the wave crosses the rest position and appears not to move
  6. 11. the spreading out of waves as they pass through an opening or around the edges of an obstacle
  7. 12. the lowest point, or valley, of a wave
  8. 14. a substance through which a wave moves