| A | B |
|---|
| air mass | a large body of air that has the properties of the surface over which it formed. |
| deforestation | the removal of forests, mostly by people who are clearing land for farming or construction |
| dew point | the temperature at which air becomes saturated with water and condensation begins |
| fog | a stratus claoud that forms on or near the ground when air is cooled to its dew point |
| front | in weather systems, the boundary between two air masses |
| greenhouse effect | the process by which heat radiated from Earth's surface is trapped and reflected back to Earth by gases in the atmosphere |
| hurricane | a large, swirling, low pressure systems with winds of at least 120 km/hour that forms over tropical oceans. |
| isobar | on a weather map, a line connecting points of equal atmospheric pressure |
| isotherm | on a weather map, a line connecting points of equal temperature |
| meteorologist | a scienctist who studies weather conditions, draws weather maps, and forecasts weather and warns of severe weather |
| precipiation | water or ice that condenses in the air and falls to the ground as rain, snow, sleet, or hail |
| relative humidity | the amount of water vapor actually in the air, compared to the maximum it can hold; it varies with temperature |
| saturated | air is full of water when the relative humidity is 100%; all the spaces in theair are filled with another substance |
| station model | in weather forecasting, a group of meterorological symbols that depicts weather information on a map |
| temperate zones | the two areas of moderate, seasonal weather that exist between tropics and polar regions |
| tornado | a small, violent, whirling, funnel-shaped, low pressure windstorm that moves in a narrow path over land |
| weather | the behavior of the atmosphere-wind, temperature, pressure, precipitation - at a particular place and time |
