Across
- 6. a boundary between two plates where they are moving past one another
- 7. the act of tectonic plates moving away from one another
- 10. formed by a rift in the earth ́s crust where plates have moved apart; a valley
- 12. new ocean floor forms between separating plates
- 14. an oceanographic method for studying the ocean floor
- 16. the theory that states that the continents were once connected
- 17. the theory that earth ́s surface consists of separate plates that move
- 19. rock formed by the cooling and solidification of hot liquid magma or lava
- 20. sudden earth movement caused by abrupt release of accumulated stress
- 21. rising mass of mantle abnormally hot or wet may lead to igneous activity
- 23. forms when heat and pressure act on igneous or sedimentary rock
- 24. long elevated region of the ocean floor with a central valley
- 25. oceanic lithosphere sinks into the mantle at a convergent boundary
- 26. a place on earth ́s crust where divergence occurs; a crack fissure or other opening in rock
Down
- 1. natural remnant magnetization of earth material
- 2. the act of tectonic plates moving toward one another
- 3. caused by intense heat and pressure from an earlier form without melting
- 4. sections of lithosphere that move slowly over the surface of the earth
- 5. ocean floor between the shoreline and the abyssal ocean floor
- 8. vent in earth ́s surface through which magma gases and ash erupt
- 9. a hot place in the mantle where magma rises often forms a volcano
- 11. the molten mixture of minerals gases and melted rock found below the surface
- 13. is an isolated volcanic peak on the ocean floor that has a flattened top
- 15. the large-scale processes involving movement of the plates of the earth's lithosphere
- 18. boundary between two tectonic plates that are moving toward each other
- 22. narrow elongated depression on the deep-sea floor