Across
- 3. -Plates spread
- 4. -Plates slide past each other
- 8. -Original supercontinent
- 11. Divergent boundary on land
- 12. Underwater mountain system sea-floor spreading
- 14. -Movement of heat energy through space
- 15. outer
- 16. -Sideways and downward movement
- 17. Liquid and solid center
- 18. Outer layer of rock
Down
- 1. trench: -Long deep depressions in ocean floor
- 2. Crust and upper mantle
- 5. -Breaks in the crust where earthquakes occur
- 6. ridge: -Underwater mountain system sea-floor spreading
- 7. -Movement of heat in liquids and glasses=warm rises, cool sinks
- 9. Soft layer below lithosphere
- 10. -Plates move together
- 13. -Movement of heat from one solid object to another