Across
- 5. a volcano that has erupted before but hasn't again
- 9. the type of weathering where acid eats away rock
- 11. process by which new soil is from from old rocks breaking apart
- 12. an area in the Pacific ocean known for volcanos
- 19. a depression at the top of a volcano
- 20. place underground directly above the focus of an earthquake
- 21. molten rock that has gone above ground
- 22. huge waves caused by earthquakes
- 24. a volcano formed from lava and tephra. (Mt.St Helens is an example)
- 27. a volcano that produces lava fountains or fire curtains
- 28. point underground where an earthquake begins
- 29. what does the temperature do as rocks get deeper into the earth?
- 31. a volcano formed from tephra
Down
- 1. a volcano that expels hot clouds of gas and dust
- 2. innermost layer of the earth, it is divided into two sections
- 3. ridges the underwater mountain ranges
- 4. the boundary between the earth's crust and mantle
- 6. middle layer of the earth, also the largest layer
- 7. a volcano that has erupted recently
- 8. smaller fragments of molten rock that instantly solidify
- 10. what the strength of an earthquake is called
- 13. mountain made when molten rock and hot gas escape from the earth
- 14. a volcano that will probably never erupt again
- 15. any trembling or shaking of the earth's crust
- 16. outermost, thinnes layer of the earth
- 17. the opening when trapped gas blasts free of the surface
- 18. a break in the boundary between two moving masses of rock
- 23. holes or cracks in the ground that gases escape from
- 25. the study of earthquakes
- 26. a broad volcano made slowly from lava buildup
- 30. scientists who study the earth