Volcanoes, earthquakes and tsunamis.

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Across
  1. 3. An instrument used to measure the strength of an earthquake.
  2. 4. The place where plates meet.
  3. 7. Molten rock below the earths surface.
  4. 8. A very large wave, or waves, created by an earthquake under the ocean floor.
  5. 9. Molten rock that flows from the crater of a volcano.
  6. 12. A sudden movement, or tremor, of the earths crust.
  7. 14. Large sections of the earths crust.
  8. 15. A roughly circular opening at the summit of a volcano.
  9. 17. An opening in the earths crust through which material is forced upwards during a volcanic eruption.
  10. 18. A volcano that has erupted in the last 2000 years but not recently.
  11. 19. Large rock fragmentsthrown out by an erupting volcano.
Down
  1. 1. The thin outer layer of the earth.
  2. 2. A force of nature, such as an earthquake or Tsunami.
  3. 5. A circle of active volcanoes around the edge of the Pacific ocean.
  4. 6. Areas, usually along plate boundaries, where earthquakes and volcanoes occur.
  5. 10. A cone shaped mountain or hill formed by lava and ash.
  6. 11. A person who studies earthquakes.
  7. 13. Fine material thrown out by a volcano whilst it erupts.
  8. 16. A volcano which is not expected to erupt again.