Across
- 5. Type of rock that has coarse grains.
- 6. The soft part of the mantle.
- 9. A type of rock that is fined grained.
- 12. The upper mantle and the crust is apart of this group.
- 13. Uses sound waves to measure distance.
- 14. Plates sliding past each other.
- 16. The ocean floor sinks back into the mantle.
- 17. Things that have been preserved in rock.
- 18. When plates move apart.
- 19. Underwater canyons.
- 20. A scientist who had a theory of what giant super continent.
Down
- 1. A break in the Earth's crust.
- 2. Plates converge.
- 3. Broken pieces in the crust.
- 4. Force pressing on the area.
- 7. Adding new material to oceans floors.
- 8. Tectonics Earths plate are moving in a constant motion.
- 10. Outer “skin” of the Earth
- 11. Mountain Ranges that ran along the ocean floor.
- 15. Earthquakes happen and they produce this.