| A | B |
|---|
| acid rain | rain with a pH less than 5 |
| sulfur dioxide | a toxic gas that is produced by volcanoes and industrial processes; one of the main gases responsible for acid rain |
| nitrogen oxides | a family of colorless gases produced by industrial processes and car engines; these gases help form acid rain when they dissolve in rain water; also formed naturally in thunderstorms |
| greenhouse effect | the warming of the lower atmosphere caused when solar radiation is trapped by gases in the atmosphere, e.g. carbon dioxide |
| global warming / climate change | a worldwide increase in the average temperature believed to be caused by the greenhouse effect |
| *catalytic converter | an anti-pollution device in a car exhaust system |
| *scrubber | apparatus for removing impurities from gas, e.g. sulfur dioxide |
| emissions | gases produced by industrial activity that can harm the environment, e.g. sulfur dioxide, nitrogen oxides |
| *corrosion | the process of being eaten away, especially by a chemical reaction |
