Across
- 4. molten material above the surface of the Earth
- 7. are formed at divergent boundaries and mainly at mid ocean ridge
- 8. plates that flow independently over the mantle
- 10. the mostly-solid bulk of Earth's interior
- 13. the only liquid layer of the Earth that contains iron and nickel
- 15. the layer right beneath the lithosphere
- 16. the scientist who came up with the theory of continental drift
- 18. the rigid outer part of the Earth that consists of the crust and upper mantle
- 19. a supercontinent that existed about 250 million years ago
- 20. molten material below the surface of the Earth
Down
- 1. the center of the Earth that is as hot as the Sun
- 2. 2 plates that slide past each other
- 3. when the dense plate sinks into the mantle
- 5. lowland region formed by a divergent boundary
- 6. theory that continents slowly move across the Earth's surface
- 9. 2 plates that move towards each other
- 11. the top and thinnest layer of the Earth
- 12. formation of new seafloor when magma comes up at mid-ocean ridge
- 14. plates of the Earth's surface that that constantly move
- 17. 2 plates that move away from each other