| A | B |
|---|
| basin | a low area that contains an ocean |
| breaker | an ocean wave that tumbles forward and breaks up as it approaches the shore, because its top is moving faster than the bottom |
| crest | the highest point of a wave |
| density current | an ocean current that occurs when denser seawater moves under an area of less dense seawater |
| salinity | a measure of the amount of solids (mostly salts) dissolved in seawater |
| surface current | an ocean current found in the upper few hundred meters of seawater |
| tidal range | the vertical distance between high tide and low tide |
| tide | the periodic change in the surface level of the oceans due to the gravitational force of the sun and moon on Earth |
| trough | the lowest part of a wave |
| turbine | a machine with fan blades that spin when water or air pushes on them; it turns a generator to produce electricity |
| upwelling | the rising of cold, nutrient-rich water from deep in the ocean to the surface. |
| wave height | the vertical distance between the crest and trough of a wave |
| wavelength | the distance between a point on one wave and the identical point on the next wave; for example, the distance between two crest |
