| A | B |
|---|
| salinity | the number of grams of dissolved salts in 1 kilogram of ocean water |
| guyot | flat-topped seamount |
| seamount | under water volcanic mountains |
| trench | long, narrow crevices in the ocean floor |
| crest | highest point of a wave |
| trough | lowest point of a wave |
| wavelength | the horizontal distance between two consecutive crests or troughs |
| wave height | the vertical distance between a crest and a trough |
| tsunamis | giant ocean waves caused by earthquakes |
| surface currents | currents caused mainly by wind |
| deep currents | currents caused mainly by differences in the density of water deep in the ocean |
| upwelling | the rising of deep cold currents to the ocean surface |
| midocean ridge | underwater mountain range |
| oceanographer | scientist who studies the ocean |
| coral reef | large masses of limestone rock surrounding a volacanic island |
| shoreline | boundary where the land and ocean meet |
