Across
- 4. thick, mostly flat layer of cool lava
- 6. has mild eruptions, cover wide area
- 9. melted rock under the ground
- 11. giant sections of lithosphere (crust)
- 12. where gas,ash,& magma come out of ground
- 14. giant cracks in Earth's surface
- 15. commonly develop into steep mountains
- 17. many volcanoes form around Pacific Ocean
- 18. at these boundaries plates move apart
Down
- 1. the resistance of a liquid to flowing
- 2. a basin shaped depression
- 3. melted rock that has reached the surface
- 5. the opening of a volcano
- 7. The largest volcano ever discovered
- 8. an opening at the top of a volcano
- 10. eruptions away from plate boundaries
- 13. at these boundaries plates move together
- 16. cinders and ash build up around the vent