Across
- 3. a form where two tectonic plates separate
- 8. crust on land
- 9. areas of weakness in the volcano
- 10. a force that squeezes something together
- 11. one super-continent
- 14. the denser plate that sinks below
- 15. the rigid layer of earth
Down
- 1. a hard black volcanic rock
- 2. crust under oceans
- 4. the occurrence of a shear strain
- 5. is described as the pulling force
- 6. ingenuous rock composed mostly of quarts
- 7. where two plates collide
- 12. the thick layer of earth
- 13. the brittle rocky outer layer of earth