Sara Grieff

1. the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge
2. measures small changes in magnetic fields
4. Gravitational force that causes a plate to move away from the crest of an ocean ridge, and into a subduction zone
5. the study of the magnetic record in rocks
7. the theory that the outer rigid layer of the earth is divided into a couple of dozen "plates" that move around across the earth's surface relative to each other
11. a supercontinent that incorporated almost all the landmasses on Earth
12. a line on a diagram or map connecting points relating to the same time or equal times
13. the pulling force exerted by a cold, dense oceanic plate plunging into the mantle due to its own weight

1. the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its outward movement on either side
3. this exists between two tectonic plates that are moving away from each other
6. when the magnetic north and south poles change places now and then
7. places where plates slide past each other
8. a large elongated depression with steep walls formed by the downward placement of a block of the earth's surface between almost parallel faults or fault systems
9. when two plates are pushing into each other and forming mountains or ripples underwater
10. the movement of continents over a period of time