Across
- 3. reversed many times in Earth's history
- 4. form on divergent/convergent boundaries
- 7. increases as we dig deeper and deeper
- 11. recycling of oceanic crust
- 13. random mantle plume where volcanoes form
- 14. "puzzle piece" part of continental drift theory
- 17. boundary where seafloor spreading happens
- 20. waxy area on which lithosphere rests
- 22. produce scratches in rock from cold time period
- 23. proposed continental drift
Down
- 1. crust + top of mantle
- 2. theory that crust is divided into sections
- 5. boundary where plates collide
- 6. alternating iron orientation on seafloor
- 8. state of matter of the inner core
- 9. idea that landmasses move
- 10. trace of organism
- 12. underwater chain of mountains
- 15. needed for coal formation
- 16. Sound Navigation and Ranging device
- 18. thickest layer of Earth
- 19. only fully liquid layer of Earth's interior
- 21. proposed seafloor spreading