Plate Tectonics

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

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