Plate Tectonics

1. Boundaries/ Locations in which two tectonic plates move apart from one another
5. Ancient Supercontinent
7. Puzzle/ One of the first pieces of evidence supporting continental drift.
11. A device uses to detect small changes in magnetic fields
13. Push/ The weight of a plate forces the plate toward the trench formed by a subduction zone
15. Evidence of Pangaea's existence
18. The process of a dense oceanic plate descending beneath another
19. Valley/ A long, narrow depression in Earth's crust

2. What is often found at Divergent, Convergent and Transform Boundaries
3. Reversal/ A change in Earth's magnetic field
4. The study of Earth's magnetic record
6. Pull/ The weight of a plate pulls the plate down into the subduction zone
8. Boundaries/ Locations in which two tectonic plates move toward each other
9. Boundaries/ Where two tectonic plates slide horizontally past one another
10. Wegener/ German scientist who developed the hypothesis of continental drift
12. of Plate Tectonics/ Theory which states that Earth's crust is broken into massive slabs, called plates
14. A line on a map that connects points with the same age
16. Spreading/ A theory that states that new ocean crust is formed at ocean ridges and is destroyed at trenches
17. A technological advance that uses sound waves to measure water depth