Tectonic Plate Review

1. Trait of Iron that determines polarity of the Earth
8. Fissures in the ocean floor that release heated water from the Earth's crust
11. Hess's theory that the ocean floor is like a conveyer belt
16. Outermost layer of the Mantle
19. Wegener's name for a supercontinent
20. The core of the Earth is made up of this metal along with Nickel
21. Two plates sliding horizontally against one another in different directions
25. Wegener's idea that the continents were once together then drifted apart
27. Two plates that come together
28. When one oceanic plate subducts, it goes down an ocean
29. When one plate goes underneath a less dense one
31. What is denser, a continental or oceanic plate

2. Two plates that move apart from one another
3. Middle layer of mantle, slow moving liquid
4. Place where two tectonic plates meet
5. Outermost layer of the Earth
6. Liquid rock in core is located here; switches polarity
7. When two of these plates meet on land they may converge to form mountains
9. Where two oceanic plates diverge and magma rises
10. Why the center of the Earth is solid rock (core)
12. Lowest layer of mantle
13. Came up with the theory of continental drift
14. These waves measure plate movement (the pen does not move but the paper does)
15. His theory of seafloor spreading supported Continental Drift
17. An educated guess
18. How closely packed atoms are together
22. Rising of warm fluid that cools, sinks, and repeats the process; helps move tectonic plates
23. Fossils of creatures who lived in abundance for a short time then went extinct
24. Theory that the Earth's crust is divided into different plates that move
25. Solid center of the Earth; is magnetic
26. Hess and other geologists used this to map the seafloor, discovering ridges and trenches
30. When two plates come together and create mountains