| A | B |
|---|
| air pollution | the addition of harmful substances to the atmosphere |
| air pollutant | anything in the air that can damage the environment or make people or other organisms sick |
| primary pollutants | pollutants that are put directly into the air |
| secondary pollutants | form when primary pollutants react with each other or with other substances in the air |
| ozone | example of a secondary pollutant; forms on sunny days when chemicalc from burning gas react with each other |
| exhaust | a gas that contains pollutants that create ozone and smog |
| acid precipitation | is rain, sleet, or snow that contains acids from air pollution |
| Allowance Trading System | limits tha amount of pollution companies can release |
| acid shock | a rapid change in a body of water's acidity |
| sewage treatment plant | a facility that cleans the waste materials found in water that comes from sewers or drains |
| nitrates | naturally occurring compounds that can affect DO levels |
| alkalinity | water's ability to neutralize acid |
| dissolved oxygen | the oxygen used by fish and other organisms that live in lakes and streams |
| nonpoint-source | pollution that comes from many sources |
| point-source | pollution that comes from one specific site |
| drain field | buried pipes that distribute cleaned water from a septic tank into the ground |
| septic tank | a tank under ground that cleans the wastewater from a household |
| conservation | efforts by industries and homes to use less water |
| pH lower than 7 | considered an acid |
| pH higher than 7 | considered an alkali (base) |
| pH of 7 | considered neutral |
| vinegar | considered an acid |
| baking soda | considered a base |
| pH scale | a scale that ranges from 0-14 |
| pH scale | measures how acidic or basic a substance is |
