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