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