Plate Tectonics

2. long, narrow mountain range on the ocean floor; formed by magma at divergent plate boundaries.
4. when magnetized objects, such as compass needles, orient themselves to point north
8. the process that occurs when one tectonic plate moves under another tectonic plate
10. the process that results when magma rises at a mid-ocean ridge and pushes oceanic plates in two different directions away from the ridge
11. the movement of Earth’s continents over time
12. boundary the boundary between two plates that move toward each other
14. boundary the boundary between two plates that move away from each other
16. boundary the boundary between two plates that slide past each other
17. an event that causes a magnetic field to reverse direction

1. an event that causes a magnetic field to reverse direction
3. when magnetized objects reverse direction and orient themselves to point south
5. the circulation of particles within a material caused by differences in thermal energy and density
6. the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
7. the rigid outermost layer of Earth that includes the uppermost mantle and crust
9. the process that results when a dense oceanic plate sinks beneath a more buoyant plate along a subduction zone, pulling the rest of the plate that trails behind it
13. theory that Earth’s surface is broken into large, rigid pieces that move with respect to each other
15. name given to a supercontinent that began to break apart approximately 200 million years ago.