| A | B |
|---|
| fetch | distance of open water over which wind blows |
| convection current | currents driven by density differences |
| ocean currents | cause an object to move in one direction |
| waves | cause an object to move up and down |
| thermohaline circulation | colder, saltier water pushing ahead warmer, fresher water |
| gyres | circular patterns that surface currents move |
| Coriolis Effect | the effect of the Earth's rotation on currents |
| upwelling | the rising of colder deeper water to replace surface water blown away |
| downwelling | the sinking of surface water near a coast |
| West Wind Drift | the strongest ocean current |
| clockwise | the direction surface currents move in the Northern Hemisphere |
| counterclockwise | the direction surface currents move in the Southern Hemisphere |
| surf | waves that break |
| surf zone | area where waves break |
| crest | highest point of a wave |
| trough | lowest point of a wave |
| wavelength | the distance between the crests of two waves |
| waveheight | the distance between the crest and trough |
| tsunami | long, high speed waves caused by underwater disturbances |
| deep ocean currents | move from cold to warm waters |
| surface currents | move from warm to cold waters |
