plate tectonics
Across
- 2. Ocean Ridge mountain ranges
- 4. Drift movement of the continents across the earth's surface
- 6. Boundary plates move apart
- 7. Core molten metal around the inner core
- 10. the upper layer of the earth's mantle, below the lithosphere
- 13. Boundary plates slip past each other
- 14. locating objects underwater and measuring the water's depth by sound
- 15. Valley pieces of earths crust come together to form a deep valley
- 16. coarse grains with a light color
- 18. Floor Spreading mid ocean ridges add new material all the time and it spreads
- 19. a break in earths crust where rocks go past each other
Down
- 1. layer of rock on earth's outer skin
- 2. a layer of hot rock
- 3. Boundary plates come together
- 5. a group of crust and the uppermost mantle in a single layer
- 8. a supercontinent
- 9. Ocean Trench ocean floor goes into the floor into underwater canyons
- 11. dark, fine, rock
- 12. an ancient organism that has been preserved in rock
- 17. Core dense ball of hard metal