| A | B |
|---|
| atmosphere | thin layer of gases surrounding earth |
| troposphere | innermost layer of atmosphere where weather occurs |
| stratosphere | "second" layer of atmosphere from earth; contains ozone layer |
| global warming | increase in temperature of earth |
| ozone depletion | reduction of ozone in the stratosphere |
| air pollution | one or more chemicals in atmosphere in amounts that cause harm to life and materials |
| primary pollutant | chemical that has been added to air by natural events or human activities and occurs in harmful quantities |
| secondary pollutant | harmful chemical formed in atmosphere when a primary pollutant reacts with normal air components or other pollutants |
| photochemical smog | mixture of primary and secondary pollutants formed under the influence of sunlight |
| industrial smog | air pollution consisting of sulfur dioxide, sulfuric acid droplets, and suspended solid particles |
| acid deposition | precipitation or gases that are acidic that can reach the earth's surface |
| pH | numerical measure of the concentration of hydrogen ions in a solution |
| asbestos | fibrous forms of minerals used for insulation and fireproofing |
| radon | colorless, odorless, tasteless gas produced by radioactive decay of uranium-238 |
