Elle McComber

3. Changes orientation of the magnetic field of the earth that have occurred from time to time.
5. Proposed mechanism for plate motion in plate tectonics.
7. Place where plates slide past each other.
8. An actively deforming region where two plates move toward each other and collide.
11. The study of the magnetic record in rocks.
13. Gradual movement of continents across earth's surface.
15. A line on a map connecting points to the same time.

1. The process of the ocean floor moving away from
2. An instrument used for measuring magnetic forces.
4. ocean ridge.
6. A linear feature that exists between two tectonic plates that are moving away from each other.
7. The theory that earth's outer shell is divided into several plates that glide over the mantle.
9. A linear-shaped lowland between several highlands created by the action of a geographic fault.
10. The sideways and downward movement of a plate of the earths crust into the mantle.
12. The portion of motion of a tectonic plate that can be accounted for by its subduction.
14. The landmass that existed when all continents were joined.