Across
- 3. Rock that forms earth’s outer skin
- 4. Breaks in earth’s crust
- 7. Item from the past that is preserved in rock
- 8. Uppermost part of the mantle
- 10. A supercontinent that existed 400 million years ago
- 11. Where 2 plates meet and spread apart
- 12. Chain of underwater mountains
- 15. Deep underwater trench
- 17. Process that adds material to the ocean floor
- 18. Pieces of earth’s lithosphere
- 19. A process in which the ocean floor sinks beneath a deep ocean trench
Down
- 1. Boundary where 2 plates slide past each other
- 2. Theory that plates are slowly moving overtime
- 3. Theory that continents are slowly moving overtime
- 5. Where 2 plates meet and collide
- 6. Layer of hot rock underneath the crust
- 9. Tool that uses sound waves to detect objects underwater
- 13. Place where earth’s crust diverge on land
- 14. Scientist that proposed theory of continental drift
- 16. Fault lines collide and produce seismic activity