| A | B |
|---|
| Air pollution | A change to the atmosphere that has harmful effects |
| Acid Rain | Gases react with water vapor that forms nitric and sulfuric acid. Can result form water vapor mixing with emissions from burning of coal |
| Greenhouse effect | Gases in the atmosphere act like windows and trap heat from the sun in the atmosphere close to the Earth |
| Global Warming | Gradual warming of the Earths atmosphere |
| Water Pollution | A change to the water resources that has harmful effects |
| Ground Water | Water that is found below the Earth’s surface |
| Drought | Less precipitation than normal for a period of time |
| Sewage | Human wastes washed down toilets, sinks and showers |
| Emissions | Particles and gases that are released into the air |
| Temperature Inversion | A layer of warm air that prevents the rising air to escape |
| Recycle | The process of reclaiming or reusing raw materials |
| Watershed | A region of land within which water flows down into a specified body, such as a river, lake, sea, or ocean; a drainage basin or catchment basin |
