| A | B |
|---|
| air mass | a large body of air with similar temperature and humidity |
| front | the place where two air masses meet and weather happens |
| barometer | an instrument for measuring air pressure |
| humidity | the amount of water vapor in the air |
| water cycle | the constant movement of water from Earth's surface to the atmosphere and back to Earth |
| evaporation | the process in which liquid changes to a gas |
| condensation | the process where a gas changes to a liquid |
| precipitation | water that falls from clouds to Earth as rain, snow, sleet, or hail |
| weather | the condition of the atmosphere at a certain time or place |
| climate | the pattern of weather an area experiences over a long period of time |
| thermometer | an instrument that measures temperature |
| meteorology | the study of weather |
| wind vane | a moveable, arrow-shaped object that shows which way the wind is blowing |
| rain gauge | an instrument to measure the amount of rain that has fallen |
| anemometer | an instrument used to measure wind speed |
| current | a stream of water that flows like a river through an ocean |
| water vapor | the gas form of water |
| hygrometer | an instrument for measuring humidity |
