Across
- 3. moving away boundary
- 4. scorched piece of mantle
- 6. conical hill that contains magma
- 8. deep groove in the ocean
- 9. seismic activity
- 10. shifting piece of earth
Down
- 1. below the lithosphere
- 2. upper layer of mantle
- 5. 1800 mile thick layer of earth
- 7. one mass of all the continents