Horizon Tectonics

3. The part of the Earth's surface that is below water and is more dense.
5. The upper part of the mantle on which the tectonic plates "float".
7. The deepest spot in all the oceans.
10. The circular distribution of volcanos around the Pacific Ocean.
13. Often the result of plates sliding past each other at a fault line.
14. The name of the rock that makes up most of the ocean floor.
15. the theory that surface of the earth is made up of individual pieces that are in constant motion.
16. An area of the mantle that is warmer and thinner that liquid rock breaks through, can result in the creation of island chains.
17. The name of the proposed super-continent that existed before the plates started moving.
18. The geologist who came up with the theory of sea-floor spreading.
19. The general name for geologic rumblings.

1. A boundary where the plates move away from each other.
2. The island nation that is splitting and growing as a result of being on top of a divergent boundary.
4. A boundary where the plates move towards each other.
6. When one plate, usually the denser one, slides underneath another plate, volcanos happen in these areas.
8. The land form that is found in the middle of the ocean and is a result of sea-floor spreading.
9. The part of the Earth's surface that is above water and is less dense.
11. The geologist who proposed that the continents were originally one super-continent.
12. A boundary where the plates slide past each other.