| A | B |
|---|
| air mass | body of air with same moisture and temperature |
| maritime | air mass that forms over water |
| continental | air mass that forms over land |
| polar | air mass that forms over poles |
| tropical | air mass that forms over tropics |
| front | boundary between air masses |
| cold front | cold air moves under warm air |
| warm front | warm air moves over cold air |
| occluded front | warm air mass is caught between 2 colder air masses |
| stationary front | cold air mass meets a warm air mass and doesn't move |
| cyclone | lower pressure air masses converge and rise |
| anticyclones | higher pressure air masses diverge & sink |
