Tectonic Plates

4. Canadian Scientist who developed Theory of Plate Tectonics
8. the boundary where the tectonic plates are sliding past each other.
9. the boundry between two tectonic plates that are moving away from each other.
12. The theory that pieces of Earth's outer crust are in constant motion.

1. plates collide, results in subduction, trench, and mountains
2. The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations.
3. Circular currents in the mantle caused by the magma being heated by the core off the Earth.
5. Area at a convergent boundary when one plate moves under another plate
6. process that creates new ocean floor at mid-ocean ridges and destroys older crust at deep sea trenches
7. Proposed the theory of sea-floor spreading
10. the man who investigated continental drift after finding fossils on opposite sides of oceans.
11. A supercontinent containing all of Earth's land that existed about 225 million years ago.