| A | B |
|---|
| Continental shelf | begins at shoreline and slopes toward the ocean |
| Continental slope | begins at the edge of the c.shelf continuing down to the flattest part of the ocean floor |
| Continental rise | base of the c.slope made of sediment |
| abyssal plain | broad flat portion of deep ocean basin |
| mid-ocean ridge | mountain chains formed where tectonic plates pull apart |
| rift valley | forms between mountains in the rift zone |
| ocean trenches | seemingly bottomless cracks in deep ocean basin |
| seamounts | a mountain of volcanic material |
| guyot | seamount with a flat top |
