| A | B |
|---|
| water cycle | The constant recycling of water on Earth |
| evaporation | The process in which a liquid changes to a gas |
| condensation | The process by which water vapor cools and changes from a gas to liquid |
| precipitation | Water that falls to Earth as rain, snow, sleet, or hail |
| wave | An up-and-down movement of water |
| storm surge | A very large series of waves caused by high winds over a large area of ocean |
| tide | A daily change in the local water level of the ocean |
| deep ocean current | An ocean current formed when cold water flows underneath warm water(density differences in water) |
| surface current | An ocean current formed when steady winds blow over the surface of the ocean |
| shore zone | The place where land and ocean meet |
| continental shelf | The ocean floor of the shore zone |
| abyssal plain | Huge flat area of deep ocean floor |
| trench | A deep ocean valley; some trenches are the deepest parts of the ocean |
| mid-ocean ridge | A vast chain of mountains that follows the center of Earth's oceans |
