Noah Harrison

3. spreading the formation of new areas of oceanic crust, which occurs through the up welling of magma at mid ocean ridges and its subsequent outward movement on either side.
6. push Ridge push or sliding plate force is a proposed mechanism for plate motion in plate tectonics.
8. an instrument used for measuring magnetic forces, especially the earth's magnetism.
9. of plate tectonics the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates.
10. boundary is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
12. boundary fault to the south, a subduction zone up north
14. reversal Changes in direction or orientation of the magnetic field of the Earth that have occurred from time to time.

1. was a supercontinent that existed during the late Paleozoic and early Mesozoic eras.
2. pull is the portion of motion of a tectonic plate that can be accounted for by its subduction.
3. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
4. boundary is a linear feature that exists between two tectonic plates that are moving away from each other.
5. the study of magnetic record in rocks
7. drift Continental drift is the movement of the Earth's continents relative to each other, thus appearing to "drift" across the ocean bed.
11. a line on a diagram or map connecting points relating to the same time or equal times.
13. valley 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.