Across
- 3. oceanic and continential plates collide
- 5. ridged layer of earth about 100 km thick
- 8. cone-shaped hill or mountain formed when hot magma, solids and gas erupt onto surface
- 9. spreading Hess’s theory that new seafloor is formed when magma is forced upward
- 10. movement of the ground that occurs when rocks inside Earth pass their elastic limits
- 12. plate portion of one block of Tectonic plates, which is not submerged in water
- 14. boundary-when two plates slide past one another
- 17. Wegner meteorologist who came up with theory of Pangaea
- 18. number of Continents
- 19. current current in earth’s mantle that is driving force for plate tectonics
Down
- 1. ridges mountains that form when two oceanic plates collide
- 2. plasticlike layer of earth which lithospheric plate floats and moves on
- 4. tectonics theory that Earth’s crust and upper mantle are broken into plates that float and move
- 6. crust A thick mass of igneous rock which lies under the ocean floor
- 7. name given to large land mass before drifting apart
- 11. plates move and separate
- 12. plates move and come together
- 13. when continental plates collide forms this
- 15. fracture that occurs when rock changes shape by breaking
- 16. valley long crack that forms between tectonics plates