| A | B |
|---|
| produces much Produces the Earth’s oxygen and serves as the base of the ocean ecosystem | Phytoplankton |
| Most algae is found here | above the continental shelf |
| Tides | the gravitational pull of the moon |
| Ocean currents | wind patterns and water density |
| The place where water meets the land | the shoreline |
| salinity | the amount of salt in water |
| volcano | underwater mountain, sometimes form an island |
| trench | deep, narrow valley |
| continental shelf | underwater extension of the coastal plain |
| Continental slope |  |
