| A | B |
| air mass | large body of air that has the same temp. and humidity throughout |
| front | where two air masses meet |
| humidity | amount of water vapor in the air |
| saturated air | air that cannot absorb any more air |
| rotation | causes weather to move from west to east |
| condensation | water vapor returns to liquid |
| atmosphere | where weather occurs |
| wind | air moving from high pressure area to low pressure area |