Across
- 1. Underwater mountain; divergent boundaries
- 3. Divide
- 5. One plate sinks
- 8. Tectonic Theory
- 10. Strong, lower mantle
- 12. Thin, under oceans
- 14. Point on Earth's surface above an earthquake
- 16. Innermost layer, iron & nickel
- 18. Beneath lithosphere, flows slowly
- 19. Deep valley; subduction zones
- 20. Thick, that forms land
Down
- 2. Solid metal
- 4. Thick middle layer, hot
- 6. Slide
- 7. Rising & cooling
- 9. Outer layer made of crust & upper mantle
- 11. Crack in Earths crust
- 13. Collide
- 15. Thin outer layer, solid rock
- 17. Liquid metal