Across
- 3. original supercontinent
- 7. soft layer below lithosphere
- 9. movement of heat from one solid object to another
- 10. hot solid rock below crust
- 12. Crust and upper mantle
- 14. valley: divergent boundary on land
- 16. Trench: long deep depressions in ocean floor
- 17. boundary: plates move together
- 18. boundary: plates slide past each other
Down
- 1. sideways and downward movement
- 2. movement of heat energy through space
- 4. breaks in the crust where earthquakes occur
- 5. layer of rock
- 6. solid outer
- 8. underwater mountain system sea-floor spreading
- 11. boundary: plates spread
- 13. liquid and solid center
- 15. movement of heat in liquids and gasses