Plate tectonics

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Across
  1. 1. – Center of the Earth
  2. 3. – Crack in Earth's crust
  3. 4. – Deep valley at subduction zones
  4. 7. – One plate goes under another
  5. 8. – Underwater mountain chain
  6. 10. – Molten rock beneath the surface
  7. 12. – Plates move apart
  8. 13. – Huge slab of Earth's lithosphere
  9. 15. – Plates move toward each other
Down
  1. 1. – Outermost layer of the Earth
  2. 2. – Mountain that erupts lava
  3. 5. – Sudden shaking of the ground
  4. 6. you like me to turn these into a crossword puzzle grid with a picture, like the earlier ones?
  5. 9. – Ancient supercontinent
  6. 11. – Layer beneath the crust
  7. 14. – Plates slide past each other