Across
- 2. When a volcano is resting
- 5. The man who discovered seafloor spreading.
- 7. An abnormally up welling of molten material within the earth's crust.
- 10. The slowest most destructive seismic waves.
- 14. The heating and cooling of rock.
- 16. When two plates move away from each other.
- 17. Composed of silica and magnesium and makes up oceanic crust.
- 18. A broad, flat volcano.
- 19. A volcano with short, steep sides.
Down
- 1. A block of rock that lies on the underside of an inclined fault.
- 3. A large sea wave caused by earthquakes or underwater landslides.
- 4. The seismic waves that arrive first.
- 6. Alfred Wegener thought continents were pulled apart by a mechanism called?
- 8. The name of the mountain that erupted in Pompeii, Italy.\
- 9. There are three types of faults, normal, strike slip and?
- 10. What seismic waves are measured by.
- 11. The movement of the earth's crust resulting from the release of potential energy between two stuck tectonic plates.
- 12. When two plates come together.
- 13. A 12 step scale that measures the intensity of an earthquake
- 15. The location on the earth's crust where the earthquake occurred.