Across
- 4. type of plate that is relatively thin, young, and dense
- 9. break in the crust where movement has happened
- 11. type of volcano made by thin, fluid lava flows
- 12. long, narrow mountain chain where new ocean crust is made
- 14. downward movement of the edge of a plate into the mantle
- 15. ratio of mass to volume
- 16. area of the mantle that is usually warm and produces volcanic activity away from a plate boundary
- 18. sudden violent shaking of the ground
- 19. valley formed by the separation of tectonic plates
- 20. solid rock layer beneath the crust
- 23. boundary where two continental plates meet
- 24. type of volcano made by alternative layers of lava and ash
- 26. type of boundary where plates move towards each other
- 30. weak, flowing part of the mantle where convection occurs
- 31. material ejected from a volcano
Down
- 1. type of boundary where plates slide past each other
- 2. line where two or more tectonic plates meet
- 3. layer of the earth made of crust and the upper rigid part of the mantle
- 5. opening in the earth's crust which produces lava, gases, or ash
- 6. solid iron and nickel
- 7. type of volcano with steep sides formed by tephra in violent eruptions
- 8. outermost layer of the Earth
- 10. molten rock on the surface
- 13. transfer of heat through a fluid
- 17. Earth's only liquid layer
- 21. narrow, deep trough formed at a subduction zone
- 22. location on the fault where an earthquake begins
- 25. type of boundary where plates move away from each other
- 27. location on the earth's surface closest to the earthquake's focus
- 28. type of plate that is relatively thick, old, and less dense
- 29. molten rock below the surface