Kennedy Mecum

3. a line or curve on a geological map or cross section connecting points of identical age
6. a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems.
8. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
11. actively deforming region where two tectonic plates or fragments of the lithosphere move toward one another and collide.
12. process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
15. an instrument used for measuring magnetic forces, especially the earth's magnetism.

1. heory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core.
2. linear feature that exists between two tectonic plates that are moving away from each other.
4. where two tectonic plates side alongside each other.
5. the portion of motion of a tectonic plate that can be accounted for by its subduction.
7. proposed mechanism for plate motion in plate tectonics.
9. continents moving away from each other
10. A change in the Earth's magnetic field resulting in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north.
13. study of the record of the Earth's magnetic field in rocks, sediment, or archeological materials.
14. supercontinent that existed long ago