| A | B |
|---|
| point-source pollution | Pollution that comes from one particular source |
| nonpoint-source pollution | Pollution that is difficult to locate because it comes from more than one source |
| 3% | The amount of the earth's water that is drinkable. |
| Sewage treatment plants | Factories that clean waste materials out of water that comes from sewers or drains |
| Primary Treatment | The first treatment of dirty water where water is cleaned in 2 different ways |
| Secondary Treatment | Water is aerated, bacteria is used, and chlorine is added |
| Septic tank | A large underground tank that collects and cleans waste water from a household |
| Renewable Resource | A resource that CAN BE replenished. |
| Nonrenewable Resource | A resource that CAN NOT be replaced once it is used.f |
| Ogallala Aquifer | A large aquifer that provides water for about 1/5 of cropland in US. It is being depleted quickly. |
