| A | B |
|---|
| continental shelf | the underwater edge of a continent (is the gently sloping part of the continent covered by shallow ocean water) |
| continental slope | the steep slope leading down from the continental shelf toward the ocean floor (is the area that begins where the continental shelf suddenly drops) |
| continental rise | the zone of sand and mud that stretches from the continental slope to the deep-sea floor |
| abyssal plain | the vast flat lands that cover the bottom of the deep, open ocean |
| rift zones | systems of cracks in the ocean floor through which magma rises |
| mid-ocean ridges | mountain chains that form along the rift zones |
| vents | openings along the rift zones that let out very hot water |
| trench | a deep narrow valley in the ocean floor |
| continental shelf |  |
| continental slope |  |
| continental rise |  |
| abyssal plain |  |
| rift zone |  |
| mid-ocean ridge |  |
| trench |  |
