| A | B |
|---|
| Relative humidity | A ratio that compares the amount of water vapor the air contains to the maximum amount that the air could hold at that temperature |
| Troposphere | Lowest layer of the earth's atmosphere |
| Layer of cool, dense air becomes trapped beneath a layer of warm air, trapping smog close to the surface | Temperature inversion |
| Removes pollutants or changes their chemical structure | scrubber |
| major source of ozone depletion | chlorofluorocarbons |
| boundary between air masses that differ in temperature and moisture level | front |
| thin layer of gases that surrounds earth | atmosphere |
| second lowest layer of atmosphere as measured from Earth's surface | stratosphere |
| release of damaging materials into the atmosphere | air pollution |
| candy bar melting in your hand is an example of | conduction |
| protects life from sun's UV rays | ozone |
| weather occurs in this layer of the atmosphere | troposphere |
| major source of air pollution | combustion of fossil fuels |
| measure of acidity or alkalinity | pH scale |
| catalytic converter | device in motor vehicles that reduces the amount of air pollutants in emissions |
| emphysema | results from being exposed to carbon monoxide |
| produced when air pollutants react chemically with another substance | secondary pollutants |
| atmospheric conditions over short time periods, within relatively small areas | weather |
| transfer of heat energy through space | radiation |
| produce severe, sudden weather changes | cold front |
