| A | B |
|---|
| runoff | rain that runs along the surface of the ground before entering a body of water |
| permeable | water can pass through this |
| aquifer | underground water |
| water table | top of an aquifer |
| reservoir | body of water behind a dam |
| desalination | turning ocean water into fresh water |
| xeriscaping | replacing lawns with drought tolerant or native plants |
| humidity | amount of water vapor in the air |
| ozone layer | protects surface of Earth from UV |
| conduction | transfer of heat by contact |
| front | area where two different air masses meet |
| primary air pollutant | for example, nitrogen oxides, carbon dioxide, and sulfur dioxide |
| secondary air pollutant | for example, ozone and sulfuric acid |
| smog | haze caused by secondary pollutants |
| temperature inversion | sandwich of warm air that traps pollutants near ground |
| scrubber | apparatus that removes particulates before they are released into atmosphere |
| chlorofluorocarbons | main compound that breaks down ozone in the ozone layer |
| Montreal Protocol | treaty designed to reduce CFC and other ozone destroying gases |
