Across
- 4. a vent that allows molten rock and hot gases to escape from within the earth
- 5. the outermost layer of the earth
- 7. a weak earthquake
- 8. melted rock while it is still underground
- 10. scientist who studies the structure of the earth
- 11. molten rock after reaching the earth's surface
- 12. the study of earthquakes
- 13. have not erupted in recorded history or are not likely to erupt again
Down
- 1. has erupted recently or is considered to likely erupt in the near future
- 2. any trembling or shaking of the earth's crust
- 3. the innermost layer of the earth
- 6. scientist who studies earthquakes
- 8. the middle layer of the earth
- 9. the study of the earth and its structure
- 14. a depression at the top of a volcano