| A | B |
|---|
| cirrus | wispy,feathery clouds made mostly of ice cyrstals that form at high levels, above about 6 kilometers |
| condensation | the process by which a gas, such as water vapor, changes into a liquid,such as water |
| cumulus | clouds that form less than 2 kilometers above the ground and look like fluffy,rounded piles of cotton |
| dew point | the temperature at which condensation begins |
| drought | a water shortage caused by long periods of low precipitation in a particular area |
| evaporation | the process by which molecules at the surface of a liquid absorb enough energy to change to a gaseous state |
| humidity | a measure of the amount of water vapor in the air |
| precipitation | forms of water such as rain,snow,sleet, and hail, that fall from clouds and reach Earth's surface |
| psychrometer | an instrument used to measure relative humidity, consisting of a wet-bulb thermometer and a dry-bulb thermometer |
| rain gauge | an instrument used to measure the amount of precipitation, consisting of an open-ended can topped by a collecting funnel and having a collecting tube and measuring scale |
| relative humidity | the percentage of water vapor in the air compared to the maximum amount the air can hold at that temperature |
| stratus | clouds that form in flat layers |
