Human impact

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Across
  1. 2. the natural agent that stimulates sight and makes things visible.
  2. 4. vacuum, air, water
  3. 5. the medium is in the same direction as the direction of the travel of the wave.
  4. 7. the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire
  5. 8. The highest surface part of a wave
  6. 10. vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear.
  7. 11. involves a change in the direction of waves as they pass from one medium to another
  8. 12. maximum amount of displacement
  9. 13. not able to be seen through
Down
  1. 1. the throwing back by a body or surface of light, heat, or sound without absorbing it.
  2. 3. , only some of the light passes through the
  3. 6. motion in which all points on a wave oscillate along paths at right angles to the direction of the wave's advance.
  4. 9. the lowest part