| A | B |
|---|
| Seafloor spreading | the process by which new oceanic lithosphere is created at mid- ocean ridges as older materials are pulled away from the ridge. |
| Convergent boundary | the boundary between two colliding tectonic plates. |
| Divergent boundary | the boundary between two tectonic plates that are moving away from each other. |
| Stress | the amount of force per unit area what is put on a given material. |
| Tension | the type of stress that occurs when forces act to strech an object. |
| Transform boundary | the boundary between two tectonic plates that are sliding past each other horizontally. |
| Tectonic plates | a piece of the lithosphere that moves around on tthe top of the asthenosphrere. |
| Compression | the type of stress that occours when an object is squeezed. |
| Subduction zone | the region where an oceanic plate sinks down into the asthenosphere at convergent boundary, usually between continental and oceanic plates. |
| Folding | the bending of fock layers due to stress of the earth's crust. |
