| A | B |
|---|
| nitrogen and oxygen | Two most abundant gases in the atmosphere |
| burning fossil fuels | Where most pollution in the atmosphere comes from |
| motor vehicles | Where nearly 1/2 of the pollution caused by humans |
| warm front | A line with half circles on a weather map. When warm air overtakes a cold air mass |
| cold front | When rapidly moving cold air mass runs into a slow moving warm air mass |
| maritme tropical air masses | Wet, warm air mass ex. West coast of U.S. |
| continental tropical air mass | Dry, warm air mass |
| continental polar air mass | Dry, cold ex. Northern U.S. in winter |
| tornado | A funnel-shaped cloud that touches Earth's surface |
| computer technology | Why has weather forecasting improved? |
| differences in air pressure | What causes wind? |
| precipitation | Any form of water that falls from clouds |
| conduction | Heat transfer between two substances that are in contact |
| decreases | As altitude increases, air pressure |
| millibars | The units for air pressure used by the National Weather Service |
| land breeze | Flow of air from land to a body of water |
| basement | Best place to seek shelter during a tornado |
| isobar | LInes on a map joining places thaat have the same air pressure |
| cumulonimbus | Clouds that can generate a thunderstorm |
| temperature and percipitation | Two factors that determine the climate of a region |
| weather fronts | Areas where air massees meet and do not mix |
| acid rain's chemicals | nitrogen and sulfur oxides |
