| A | B |
|---|
| renewable resource | A resource that can be replaced within a reasonably short period of time. |
| non-renewable resource | A resources that cannot be replaced after it is used. |
| fossil fuel | A fuel that formed over many years from the remains of living organisms. |
| groundwater | Water from rain or snow that sinks into the earth and is stored there. |
| air pollution | The addition of any unwanted substance into the air. |
| pollutant | An unwanted substance added to the air, land or water. |
| carbon monoxide | A colorless, odorless, poisonnous gas made of carbon and oxygen. |
| ozone | A molocule of oxygen that contains three atoms of oxygen. |
| acid rain | Rain containing acids formed when air pollutants react with water vapor. |
