| A | B |
|---|
| basin | low areas of land filled with water |
| salinity | measure of the amount of dissolved solids present in seawater |
| surface currents | movement of water parallel to Earth's surface; caused by winds |
| upwelling | movement of deep, cold water to the ocean surface |
| density currents | occurs when cold, salty water sinks and moves deeper into the ocean basin |
| wave | a rythmic movement that carries energy through matter or space |
| crest | highest point of a wave |
| trough | lowest point of a wave |
| breaker | a wave that collapses as the top of the wave outruns the bottom |
| tide | rise and fall of sea level caused by the gravty of the moon |
| tidal range | difference in water level between high and low tides |
| spring tides | large tidal range; caused by the Earth, moon, and sun being in a straight line |
| neap tides | small tidal range; occur at 1st and 3rd quarter moons |
| diurnal tides | one high tide and one low tide per day |
| semi-diurnal tide | two high tides and two low tides per day |
