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4. portion of motion of a tectonic plate that can be accounted for by its seduction.
5. drift the gradual movement of the continents across the earth's surface through geological time.
6. linear feature that exists between two tectonic plates that are moving away from each other.
8. Earth's outer shell is divided into several plates that glide over the mantle
9. a line on a diagram or map connecting points relating to the same time or equal times.
11. a change in the earths magnetic field
12. the branch of geophysics concerned with the magnetism in rocks that was induced by the earth's magnetic field at the time of their formation.
13. super continent that existed during the late Paleozoic and early Mesozoic eras.

1. instrument used for measuring magnetic forces, especially the earth's magnetism.
2. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
3. 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.
5. s an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
7. the formation of new areas of oceanic crust
8. type of fault whose relative motion is predominantly horizontal in either sinistral or dextral direction.
10. sliding plate force is a proposed mechanism for plate motion in plate tectonics