Across
- 5. Vent in the earth's surface through which magma and gases erupt
- 7. A sudden, violent shaking in the ground that happens as a result of movements within the earth's crust
- 8. A steep-sided depression in the ocean floor
- 10. The only liquid layer of the Earth
- 12. The type of boundary when two plates are moving apart from each other
- 13. A type of tectonic plate at the bottom of oceans
- 14. The theory of the plates moving
- 16. An arc shaped chain of volcanoes formed above a subduction zone
- 18. Type of boundary when two plates are pushing towards each other
- 20. Molten rock, gases, and solid crystals and minerals
Down
- 1. A crack or fracture in the earth's crust associated with transform boundaries
- 2. A large mass that rises above earth's surface with sloping sides
- 3. The place where two plates meet
- 4. The layer of the atmosphere that lays above the asthenosphere and has plates that float in hot semi-liquid in the upper mantle
- 6. The early cluster formation of the continents
- 9. Area where one plate is being pulled under the edge of another
- 11. The earth's crust that makes up the continents
- 15. Device used to measure the intensity of earthquakes
- 17. The type of boundary when two plates are sliding past each other
- 19. When magma reaches the surface and flows