Across
- 1. ridge / where plates move apart
- 6. Spot / an area of intense volcanic activity
- 8. / this confirmed the existing of sea-floor spreading
- 11. plate / large mobile slab of crust
- 13. / combines magnitude and intensity of an eruption
- 14. / man is the main driver
- 16. trench / deep, go in to here at your peril in your submarine
- 19. spreading / lateral movement of new oceanic crust
- 20. zone / the dynamic zone of subduction
- 21. / a volcanic peak rising steeply from the sea floor
Down
- 1. / between crust and mantle
- 2. / below the lithosphere
- 3. arc / a line of islands
- 4. / another word for convergent plate margins
- 5. / another word for divergent plate margins
- 7. / he worked on his idea from 1912 until his death in 1930
- 9. plain / the deepest part of the ocean covering a vast area.
- 10. basalt / The Deccan traps are evidence of this.
- 12. / where the plates are
- 15. drift / the changing face of planet Earth
- 17. / the downfolded section of a rift valley
- 18. / vertical movement in the Earth's crust
- 21. / type of volcano with wide and gently sloping flanks