Journey to the Center of the Earth

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Across
  1. 2. planet
  2. 4. rock
  3. 5. helmet
  4. 9. volcano
  5. 11. clouds
  6. 13. smoke
  7. 14. fire
  8. 15. centre
Down
  1. 1. space
  2. 3. earth
  3. 6. magma
  4. 7. lava
  5. 8. rocket
  6. 10. suits
  7. 12. silver
  8. 13. safety