Across
- 5. spreading of oceanic crust
- 6. fracture in the ground where earthquakes usually occur
- 11. moving in different directions
- 12. coming together
- 13. rigid outer part of the earth
- 15. sideways downward movement of a tectonic plate
Down
- 1. mountain with an opening where magma shoots through
- 2. valley between highlands
- 3. one plate moving up and one moving down
- 4. long narrow ditch
- 7. breaking off
- 8. tectonic plates moving upward together
- 9. mountain range in south america
- 10. long chain of active volcanic islands
- 14. outermost shell of the earth