Across
- 4. Ocean floor sinks beneath a deep ocean trench and back to the mantle
- 9. Deep underwater canyons
- 13. Plates come together,or converge
- 17. Plates slip past each other
- 18. Continually adding new materials to the ocean floor
- 20. Results from a force pressing on an area
- 21. Mountain ranges that ran along the middle of some ocean floors
- 23. The layer of rock that forms Earth's outer skin
Down
- 1. Part of the mantle that is less rigid than the rock above
- 2. Theory that plates are in slow, constant motion
- 3. Layer of molten metal materials
- 5. Dark,fine-grained rock
- 6. Part of the mantle that is strong hard and rigid
- 7. Plates move apart, or diverge
- 8. Dense ball of solid metal
- 10. Landmass slowly moved over Earth's surface
- 11. made of mostlty iron and nickel
- 12. Breaks in Earths crust
- 14. sections of Earth separated by cracks
- 15. Rock usually with light colors and has coarse grains
- 16. Any trace of an ancient organism
- 19. single landmass, about 300 million years ago
- 21. Part of the mantle that is hot but more rigid
- 22. Is a large landmass