| A | B |
|---|
| Abyssal Fan | A pile of sediments in a fan-like shape, usually at the mouth of a river. |
| Abyssal Plain | A very flat, deep, stable area of the ocean floor. |
| Alvin | The most famous submersible; helped find HMS Titanic. |
| Continental Shelf | The part of the continental crust that is underwater. |
| Continental Slope | Slants downward to the depths. |
| Convergent Boundary | Where two tectonic plates are moving together. |
| Deep Sea Submersibles | "Submarines" used to study the oceans. |
| Divergent Boundary | Where two tectonic plates are moving apart. |
| Hot Spot | A "hot" area below the crust that gives rise to volcanic activity. |
| Guyot | A flat topped seamount. |
| Oceanic Ridges | Long mountain chains that run parallel to divergent boundaries. |
| Seafloor Spreading | Where new ocean crust is being formed; as with the mid-atlantic ridge area. |
| SONAR | Bouncing sound waves off the bottom of the ocean to creat a picture of the shape of the sea floor. |
| Paleomagnetism | One clue that supports sea floor spreading. |
| Transform Boundaries | Side to side moving boundaries. |
| Deep Sea Trench | Often near subduction zones. |
| Seamount | Underwater mountains. |
| Vents | Volcanic areas where life can exist without sunlight. |
| Island | A seamount that rises above the water. |
| Submarine Canyons | A gulley usually cut into the continental slope by a river. |
