Across
- 5. when two plates slide past each other
- 6. what all of the continents used to be called
- 8. underground lava
- 10. dicovered continental drift
- 12. Alfred Wegener's discovery
- 13. there are this number of major plates in the world
- 15. a current in the mantle
Down
- 1. pieces of the Earth's crust
- 2. when two plates come together
- 3. the innermost layer of the Earth
- 4. the technology Harry Hess used to discover seafloor spreading
- 7. discovered seafloor spreading
- 8. 2nd layer of the Earth
- 9. when two tectonic plates move away from each other
- 11. where seafloor spreading takes place
- 14. most outward layer of the Earth, we live on it