Plate Tectonic

1. Arc /a chain of volcanic mountains formed at an ocean-continental convergent boundary
3. Zone /the more dense plate us pulled into the mantle under the less dense plate
5. Valley /formed when two plates pull apart and land falls downard
6. Tectonics /Theory that plates that move due to convection currents
8. /another name for them mantle
12. Currents /circular movement of a substance due to changes in temperature and density
13. Range /formed at a continental-continental convergent boundary
14. Boundary /when two plates pull apart
15. Floor Spreading /when two oceanic plates pull apart, magma rises and new crust is formed
16. /another name for the crust
21. /thickest layer of the Earth, part liquid part solid where convection currents are found
22. Wegener /credited with the theory of Continental Drift
23. /outer layer of the Earth, the thinnest layer

2. Boundary /when two plates come together
4. /large pieces of earths crust that move due to convection currents
7. Crust /earths crust made of land
9. /depression formed at a subduction zone
10. /large supercontinent that existed 250 million years ago
11. Boundary /when two plates grind past each other
13. Atlantic Ridge /divergent boundary in the middle of the Atlantic Ocean
17. Arc /a chain of volcanic islands formed at an ocean-ocean convergent boundary
18. Crust /earths crust located under the ocean
19. Hess /credited with the theory of Plate Tectonics
20. /a break in the earths crust that moves