| A | B |
|---|
| Ocean current | Any continuous flow of water in the ocean |
| Surface current | Ocean current that flows in the upper 1000 meters |
| Eddy | A circular current or whirlpool |
| Current | Something that flows, such as a stream |
| Gulf Stream | A narrow, intense, warm current in the North Atlantic |
| Sargasso Sea | An area of warm water and light winds in the middle of the North Atlantic Ocean |
| Gulf Stream ring | eddy that breaks away from the edge of the Gulf Stream |
| Cold-core ring | An eddy that forms a ring with a core of cold water |
| Warm-core ring | An eddy that forms a ring with a core of warm water |
| Density current | A subsurface current that is heavier or more dense than the surrounding water |
| Upwelling | Vertical movement of cold, deep ocean water |
| Global Conveyor Belt | Model of ocean current that shows how water moves from equatorial to polar regions |
| Strait of Gibraltar | Connects the Mediterranean Sea to the Atlantic Ocean |
| Isthmus of Panama | Land bridge that connects North and South America |
| Tides | The periodic rise and fall of the ocean surface due to the gravitational pulls of the moon and sun |
| Perigree | Point closest to Earth in the moon's orbit |
| Apogee | Point farthest to Earth in the moon's orbit |
| El Nino | Warm surface current in the Pacific Ocean |
