Science

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Across
  1. 5. interrelation of electric currents
  2. 9. surface curved
  3. 12. being compressed
  4. 14. change in direction of propagation of any wave
  5. 16. sounds caused by the reflection of sound waves from a surface
  6. 17. curling foamy top of a wave
  7. 18. a hollow between two wave crests in the sea
  8. 19. triangular with refracting surfaces at an acute angle
Down
  1. 1. to vibrate
  2. 2. automatic
  3. 3. a force acts on objects at a distance
  4. 4. throwing back by a body or surface of light, heat, or sound without absorbing it
  5. 6. extending across something
  6. 7. one thing absorbs or is absorbed by another
  7. 8. allowing light to pass through
  8. 10. diminution in the density of something
  9. 11. measured from east to west
  10. 13. not transparent
  11. 15. a space entirely devoid of matter