| A | B |
|---|
| Ferdinand Magellan | first to circumnavigate the world |
| Pacific Ocean | largest ocean |
| Arctic Ocean | covered by large masses of ice |
| Dead Sea | six times as salty as the ocean |
| coral reef | chain of rocks near surface of water |
| oceanographer | a scientist who studies oceans |
| tides | rising/falling of ocean water levels |
| surface currents | strong flow of water caused by wind |
| waves | up and down movement of ocean water |
| salinity | the amount of dissolved salt in water |
| salt | comes from minerals in rocks |
| gases | oxygen, nitrogen, and carbon dioxide |
| ocean water | contains salt, gases, and minerals |
| dissolved minerals | carried to oceans by rivers |
| fresh water | less salty than ocean water |
| Challenger Deep | deepest spot in the ocean |
| deep ocean currents | movement of water caused by temperature changes |
| gravity | pulling force between two objects |
| water cycle | movement of water between ocean and air |
| temperature of ocean water | different in different places |
