Across
- 3. lava that forms tubes,smooth and ropy
- 6. where geological feature is cut in half
- 7. most dangerous volcano
- 8. type of lava that erupts underwater
- 10. large but not steep volcano
- 12. plates that come towards each other
- 14. used to create first detailed ocean floor map
- 17. releasing bend,can form depressions
- 18. developed continental drift theory
- 19. zone where plates split apart
Down
- 1. volcano,felsic to intermediate rock
- 2. less deadly type of eruption
- 4. scientist that first looked at ridge patterns, 1959
- 5. compression added to shearing motion
- 6. study of magnetic fields frozen in rocks
- 9. most typical volcano
- 11. measure of strength of earthquake
- 13. more dangerous volcanic eruption
- 15. molten rock found within volcanic chambers
- 16. plates that spread away from each other