Across
- 3. The name of the super continent that exited about 300 million years ago.
- 4. Valley A deep valley is also called a.
- 8. Tectonics Slow motion driven by the convection current makes.
- 10. Boundary The plates are sliding.
- 11. The ocean floor sinks back into the mantle.
- 12. Core This is the 3rd layer from the top to the bottom.
- 13. These land feature form at a Convergent Boundary.
- 16. There are convection currents in this layer.
- 17. Trench Under water canyons, sea-floor spreading ends here.
- 20. 2nd layer of Earth from the top, very hot & solid.
Down
- 1. Spreading New crust is being added and older crust is being pushed outward
- 2. Crust This crust lies beneath the ocean floor.
- 5. These create cracks in the crust.
- 6. Sits on top of the mantle, 100 km thick.
- 7. Boundary The plates collide.
- 9. Drift The continents slowly move about 2 centimeters per year.
- 14. Boundary The plates are dividing.
- 15. Ridge Sea-Floor Spreading begins here.
- 18. 5-80 km thick, top layer.
- 19. Core Solid metal, mostly iron & nickel, 1,200 km thick.