| A | B |
|---|
| submersibles | underwater research vessel |
| bathyscaph | self-propelled submarine fpr research |
| sonar | transmittor that maps ocean floor |
| continental margins | shallow portions of the ocean floor |
| continental shelf | part of the continent covered by ocean |
| continental slope | steeper slope at edge of continental slope |
| submarine canyon | deep valley in continental slope and shelf |
| turbidity currents | dense currents that carry sediments from submarine canyons |
| continental rise | sediments form a raised edge at base of continental slope |
| trenches | long narrow places; deepest places on earth |
| abyssal plains | flattest region on earth |
| fracture zones | faults in ocean floor perpendicular to ridge |
| seamount | underwater isolated volcanic mtns. |
| rift | narrow depression in mid ocean ridge |
