Across
- 2. Geologist that discovered that mid-ocean ridges were expanding
- 4. Bendable solid layer of the earth that has convection currents
- 6. Fernlike plant,from 250 million year ago, found on 5 continents
- 8. Layer between the crust and the core
- 9. Theory:the continents were once a single landmass(hint:2 word answer with no space)
- 10. Mass in a given space
- 14. The cycle of rising and falling of molten rock in the mantle
- 15. Earth layer made of crust and upper mantle, rigid
- 17. Layer of the earth that is a liquid
- 18. Tool that uses sound waves to measure the distance of an object
Down
- 1. Scientist that observed that the coastlines of continents matched up
- 3. Name of the supercontinent
- 5. Dark fine grained rock found in the oceanic crust
- 7. Process:the ocean floor sinks below a trench
- 11. Hottest layer of the earth
- 12. Rock that is light colored usually found in the crust
- 13. Reptile that lived in free water millions of years ago
- 16. Type of crust that is made of basalt