Plate Tectonics

4. Two plates that move besides each other
7. Large movable segments of the lithosphere
8. The gradual movement of the continents across the earth's surface
10. The smallest tectonic plate
12. Pieces of the lithosphere independently travel and move on the mantle
15. German climatologist who first theorized continental drift
16. Sub marine mountain ridges where new seafloor is created by seafloor spreading
17. Viscous liquid part of mantle underneath the lithosphere
19. Two plate that move towards each other

1. A mountain range formed when two continental plates collide
2. American geophysicist who theorized seafloor spreading
3. Boundaries between plates
5. The tectonic plate that we are on right now
6. Crust and uppermost mantle
9. The formation of new areas of oceanic crust, which occurs through the upwelling of magma at mid ocean ridges and its subsequent outward movement on either side
11. The hypothetical landmass that existed when all continents were joined
13. The tectonic plate where most earthquakes occur
14. Two plates that move away from each other
18. The action or process in plate tectonics of the edge of one crustal plate descending below the edge of another
20. Long, narrow depressions on the seafloor that form at the boundary of tectonic plates where one plate is pushed, or subducts