| A | B |
|---|
| groundwater | A form of fresh water that is found under Earth's surface |
| estuary | A place where fresh water from a river mixes with salt water from the ocean |
| evaporation | The process by which a liquid changes into a gas |
| condensation | The changing of a gas into a liquid |
| precipitation | The water that falls to Earth as rain, snow, sleet, or hail |
| water cycle | The movement of water from Earth's surface into the air and back to the surface again |
| heat | thermal energy |
| types of water | salt, fresh |
| revolution | the movement of one object around another in space |
| rotation | the spinning of an object on its axis |
| axis | the imaginary line that goes through the north and south pole |
