| A | B |
|---|
| water cycle | the continuous movement of water between the earth and the air |
| transpiration | the process by which plants release water vapor |
| cirrus | high altitude clouds made of ice crystals rather than water drops |
| high relative humidity | describes the air on a hot, sticky day |
| dew | forms when water vapor condenses out of cooling air at night |
| sleet | rain the freezed before it reaches the ground |
| water | the only natural substance that exists on Earth in all three phases at normal temperatures |
| condensation | vapor to liquid phase change |
| sublimation | vapor to solid or solid to vapor phase change |
| evaporation | liquid to vapor phase change |
| psychrometer | used to measure relative humidity |
| condensation nuclei | small particles that give a place for condensation to take place |
| dew point | the temperature at which air becomes saturated |
| % | unit for relative humidity |
| degree Celsius | unit for dew point |
| freezing rain | glaze |
| glaze | precipitation that falls as a liquid but freezed on cold objects |
| windchill | wind makes the air feel cooler than it reall is |
| oxygen | gas that makes up 21% of our air |
| nitrogen | gas that makes up 78% of our air |
| stratus | clouds that are in layers or sheets |
| cumulonimbus | tall, billowing clouds that bring rain and thunderstorms |
| cumulus | piled up, puffy clouds |
| humidity | water vapor in the air |
| relative humidity | compares the amount of water vapor in the air with the amount the air could hold |
| frost | the result when the dew point is below freezing |
| precipitation | the part of the water cycle in which water is returned to Earth |
| snow | solid precipitation that we crave |
| hail | layered icy precipitation |
| virga | precipitation that doesn't reach the ground |
