Tectonic plates

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Across
  1. 4. The second deepest layer of the earth
  2. 6. When the plates of the earth move away from each other
  3. 8. A very large continent from long ago
  4. 9. Plates the earth sits on
  5. 10. The inner most layer of the earth
  6. 11. A mountain which spews out lava
  7. 13. Lower most level of the mantel
  8. 14. A boundary where plates slide past each other
  9. 15. The start of a river
Down
  1. 1. A boundary where plates move away from each other
  2. 2. A boundary where plates press up against each other
  3. 3. When the earth shakes
  4. 5. Upper most level of the mantel
  5. 7. A short and skinny valley
  6. 12. A large pointed rock often found near foot hills