physics term

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Across
  1. 3. the process of one tectonic plate sliding underneath another
  2. 4. when heat, energy or sound comes back from a surface
  3. 6. liquid rock on the surface of the earth
  4. 8. the most central part of the earth’s structure
  5. 12. areas of the earth’s crust that can move relative to one another
  6. 13. liquid rock below the surface of the earth
  7. 16. the highness or lowness of a sound
  8. 17. very small pieces of matter
  9. 18. in a liquid state
  10. 20. a hard outer covering
  11. 22. the strength of an earthquake
  12. 24. the movements that transfer sound through air or water
Down
  1. 1. a word used to describe a volcano that has recently erupted or may erupt again
  2. 2. an opening in the earth’s crust through which lava, gases, steam and dust erupt
  3. 5. the strength or weakness of a sound
  4. 7. the part of the earth between the outer core and the crust
  5. 9. a word used to describe a volcano that will not erupt again
  6. 10. the reflection of a sound wave
  7. 11. a quality of a substance or material
  8. 14. the substance that waves move through
  9. 15. a straight line in which light travels
  10. 19. the property of a substance that will not allow light to pass through
  11. 21. an area of darkness caused by light being blocked by an opaque object
  12. 23. sudden violent movement of the earth’s crust