Planet Earth

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Across
  1. 5. A supercontinent that existed 200 million years ago
  2. 6. Another word for "cracks"
  3. 8. These form when plates collide
  4. 11. The boundary between the Pacific and North American Plate in California
  5. 13. When one plate slides beneath another
  6. 16. The term given to the plates carrying our continents slowly around the earth
  7. 19. This measures the force of an earthquake
  8. 20. This term is given to a volcano that has not erupted for a long time but could erupt again
  9. 21. This is an example of a volcanic island
  10. 23. An area in Antrim, formed from volcanic activity
  11. 26. The centre of the earth
  12. 27. When plates separate, __________ mountains can form
  13. 28. Hot molten rock found deep within the earth's crust
  14. 29. What magma travels through
  15. 31. The area on the surface of the earth where an earthquake is most strongly felt
Down
  1. 1. __________ currents cause the plates of the earth to move
  2. 2. Where lava pours from
  3. 3. Where a major earthquake struck in 1906
  4. 4. This is used for identifying tremors in the earth's crust
  5. 7. Mountains that have formed on the ocean floor because of volcanic activity
  6. 9. When magma cools on the surface it is given this name
  7. 10. ________ shaped mountains form from the build up of lava and ash
  8. 12. The world's youngest type of fold mountains
  9. 14. These mountains formed during an era 400 million years ago
  10. 15. A giant tidal wave that happens because of an earthquake
  11. 17. The crust of the earth is broken in to a number of...
  12. 18. The term given to a volcano that erupts regularly
  13. 22. Before entering the vent, the magma comes from the ________ _________
  14. 24. Another word for small tremors
  15. 25. The plate Ireland sits on
  16. 28. The temperature of the ________ is about 4000 degrees celcius
  17. 30. The place within the crust where an earthquake occurs