| A | B |
|---|
DENSITY,  | What causes one plate to sink under another as they converge |
| MID-OCEAN RIDGE | The undersea mountain chain where new ocean floor is produced; a divergent plate boundary.,  |
| DEEP-OCEAN TRENCH | A deep valley along the ocean floor through which oceanic crust slowly sinks toward the mantle.,  |
| FAULT | A break or crack in Earth's lcrust along which the rocks move.,  |
| TRANSFORM BOUNDARY | A plate boundary where two plates move past each other in opposite direction.,  |
| DIVERGENT BOUNDARY | A plate boundary where two plates move away from each other.,  |
| RIFT VALLEY | A deep valley that forms where two plates move apart (diverge).,  |
| CONVERGENT BOUNDARY | A plate boundary where two plates move toward each other.,  |
| RING OF FIRE | The volcanic activity on the edges of the Pacific plate |
