| A | B |
|---|
| evaporation | The process by which a liquid changes into a gas |
| condensation | The process by which a gas changes into a liquid |
| weather | The condition of the atmosphere at a certain place and time |
| anemometer | An instrument for measuring wind speed |
| barometer | An instrument for measuring air pressure |
| air mass | A large body of air that has similar temperature and humidity throughout |
| prediction | A statement of what will happen, based on observations and knowledge of cause-and-effect relationships |
| front | The border where two air masses meet |
| meteorology | The study of weather |
| humidity | A measurement of the amount of water vapor in the air |
| hygrometer | An instrument for measuring humidity |
| current | A stream of water that flows like a river through the ocean |
| climate | The pattern of weather an area experiences over a long period of time |
| water vapor | The gas form of water |
| precipitation | Water that falls from clouds to Earth's surface |
| water cycle | The constant movement of water from the surface of Earth to the air and back again |
