| A | B |
|---|
| cold front | sudden weather and thunderstorms |
| warm front | gradual weather change - steady rain |
| occluded front | cold air traps warm air above ground |
| stationary front | 2 air masses come to a "stand off" |
| low air pressure | moist air can move in |
| warm air | less dense |
| cold air | more dense |
| wind | when air particles move from dense areas to areas where the air is less dense |
| air pressure | the push of air |
| high pressure areas | few clouds |
| low pressure areas | room for clouds and moisture |
| front | boundary between two air masses |
| jet stream | area between the troposphere and the stratosphere |
| troposphere | layer of the atmosphere directly above the earth's surface - extending up about 10 km |
| exosphere | outer atmosphere - 400+ km |
| mesosphere | from about 50-100km up -100degrees celcius |
| thermosphere | layer of atmosphere where satellites usually orbit |
| atmosphere | layers of gases surrounding a planet |
| clouds | when air particles come closer together - and squeeze out water vapor |
