Across
- 3. The outermost part of Earth that is mostly made up of granite.
- 5. Steep-walled depression around a volcano's vent.
- 6. The point of Earth's surface directly above an earthquake's focus.
- 8. A device used by scientists to record primary, secondary, surface waves from earthquakes.
- 9. The theory that explains how and why continents move
- 12. Rigid, outermost layer of the earth that is about 100km thick.
- 13. A common rock type within the oceanic crust.
- 16. The large opening formed when the top of a volcano collapses.
- 17. A scientist who studies earthquakes and seismic waves.
- 19. Surface along which rocks break and move?
- 20. There are ___ primary plates that form Earth's crust.
Down
- 1. The name Alfred Wegener gave to the super-continent.
- 2. A geological process in which one edge of one crustal plate is forced below the edge of another.
- 4. A common rock type found within the continental crust.
- 7. A sudden movement along the boundary of a tectonic plate is called?
- 10. Tectonic plates float on the _?
- 11. Seismic sea wave
- 14. What lies directly beneath the crust?
- 15. Opening in the earth's surface that often forms a mountain when layers of lava and volcanic ash erupt and build up.
- 18. Measure of the energy released by an earthquake.