Across
- 3. vibrations that tell us about Earth's layers
- 7. thick layer of hot rock, below lithosphere
- 9. heat transfer that drives the plates
- 12. liquid metal layer of Earth
- 14. heat transfer, direct contact
- 15. the "supercontinent"
- 17. proposed the idea of continental drift
- 18. technology that uses sound echoes
- 20. generated by the liquid outer core
- 21. decreases as heat is added
Down
- 1. found mid-ocean ridges
- 2. definite volume but no definite shape
- 4. freshwater creature, no salt water!
- 5. soft part of upper mantle
- 6. organisms make energy without light
- 8. system of underwater mountains
- 10. crust + uppermost mantle
- 11. plates pull apart at a___boundary
- 13. discovery that ocean crust moves
- 14. idea that landmasses move
- 16. trace of an organism
- 19. transfer of heat through space