Across
- 2. remnant of something that existed long ago; preserved in rock
- 6. where the Earth’s crust has broken
- 7. supercontinent formed 300 million years ago
- 8. measures distance to an object through sound waves
- 9. causes the Earth’s plates to move
- 12. seperating plates
- 14. forms faults
- 15. theory of the slow, constant motion of Earth’s plates
- 16. forms when crust diverges on land
- 17. underwater mountain range
- 18. mass divided by volume
- 19. theorized that the continents slowly moved over the surface of Earth
- 20. outer shell of the lithosphere
Down
- 1. higher density crust sinks beneath a deep-ocean trench
- 3. new crust pushes old rock further from mid-ocean ridges
- 4. when molten material hardens quickly, these form
- 5. plates come together
- 10. the continents have moved over earth’s surface
- 11. where oceanic crust bends downward
- 13. 3,000 meters of hot, solid rock