Across
- 4. more than 40 of these are known
- 5. lowers rocks melting temperature
- 8. slabs of oceanic crust
- 10. lava fragments that harden in the air build
- 14. stuff held under pressure in the molten rock
- 16. hot fast-moving basaltic lava
- 17. long belt of volcanoes
- 19. flowing of lava
- 22. forms in crust
Down
- 1. pressure drops
- 2. resistance to flow
- 3. volcanic activity occurs within plate
- 6. steep-walled depression
- 7. where plates pull apart
- 9. opening to the surface
- 11. large nearly symmetrical volcanic mountain
- 12. depth increases
- 13. pyroclastic that eventually build a mountain
- 15. temperature
- 18. volcanic eruptions
- 20. cooler slowering moving basaltic lava
- 21. produced by the accumulation of fluid lavas