| A | B |
|---|
| barometer | measures air pressure |
| wind vane | shows wind direction |
| weather | condition of the air around us |
| relative humidity | amount of water vapor in the air compared with what it could hold if saturated |
| air pressure | the weight of the air above |
| anemometer | measures wind speed |
| boiling | steam comes out of a kettle |
| condensation | dew forms on grass in the morning |
| evaporation | clothes dry when hung on a line |
| freezing | making ice cubes |
| melting | a snow sculpture disappears |
| stratus | type of clouds that form large thick layers |
| wind | caused by differences in air pressure between 2 areas |
| cirrus | thin, featherlike, ice crystal clouds |
| stratus | cloud type that cause fog |
| nucleus of most atoms | contains protons and neutrons |
| nucleus | central core of an atom |
| solutions | mixtures in which parts are evenly mixed |
| when elements combine to form compounds, their properties_____ | change |
| element | matter made up of only one kind of atom |
| rust | example of a compound |
| three states of matter | solid, liquid, gas |
| particles move fastest to slowest | gas-->liquid-->solid |
| particles have the greatest to least attraction for each other | solid-->liquid-->gas |
| saturated air has a relative humidity of ___ | 100% |
| when air pressure decreases the barometer___ | falls |
