| A | B |
|---|
| humidity | a measurement of how much water vapor is in air |
| air pressure | the force put on a given area by the weight of the air above it |
| stratus cloud | a cloud that forms in a blanket-like layer |
| cumulus cloud | a puffy cloud taht apepars to rise from a flat bottom |
| cirrus cloud | a high altitude cloud with a featherlike shape, made of ice crystals |
| air mass | a large region of the atmosphere where the air has similar properties throughout |
| front | a boundary between air masses with different temperatures |
| warm front | a boundary between air masses where the warm air mass slides up and over the cold air mass |
| cold front | a front where cold air moves in under a warm air mass |
| stationary front | an unmoving front where a cold sair mass and a warm air mass meet |
