| A | B |
| Surface Current | Horizontal flow of water at the ocean's surface |
| Gyre | Circuit of mid-latitude currents around the periphery of an ocean basin |
| Ekman Transport | The total layer movement of the water, according to the Ekman spiral |
| Geostrophic gyre | a gyre in balance between the Coriolis effect and gravity, current "turned by the earth" |
| West Wind Drift | The fastest of all currents because it is not deflected by any continent, circles Antarctica |
| Meterological Equator | Located at 6 degrees north,imaginary line where two thermal currents meet, North of geological equator. |
| Western Boundary Currents | Strong, Warm, Concentrated, Fast moving currents on the western boundary of the ocean, or the eastern boundary of the continent |
| Gulf Stream | Strong Western Boundary current of the North Atlantic, off the east coast of the US |
| Sverdrup | unit of volume transport, 1 million cubic meters of water per second, 300 times the Amazon flow |
| Eddies | Circulation movement of water usually formed where currents pass obstructions, or between two adjacent currents flowing in opposite directions |