Living on the edge

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Across
  1. 4. the middle layer of the earth between the crust and the core
  2. 6. the depression at the top of a volcano fro which lava and ash erupt
  3. 7. the thin outer layer of the earth
  4. 8. solid rock which lies beneth the soil
  5. 9. the line where two plates meet
  6. 11. the point below the ground where an earthquake occurs
  7. 12. a large segment of the earth's crust
  8. 14. a violent movement in the earth's crust
  9. 15. a huge wave caused by an earthquake,
  10. 18. the scale used to measure
  11. 19. a wave of energy from an earthquake
Down
  1. 1. a crack in the earth's crust
  2. 2. molten rock beneth the earth's surface
  3. 3. an instrument used the measure the strength of earthquakes
  4. 5. small earthquake that sometimes follows the bigger one
  5. 7. part of the earth's crust beneth the land
  6. 10. fine particles of rock thrown from a volcano when it erupts
  7. 13. the point on the earth's surface above the origin of an earthquake
  8. 16. molten rock from a volcano
  9. 17. the middle part of the earth