Terms : Hide Images
| 9821564847 | Atmosphere | Thin layer of gases that surrounds Earth | 0 | |
| 9821564848 | Relative Humidity | The ratio of water vapor the air contains to the maximum amount it could have at that temperature | 1 | |
| 9821564849 | Air Pressure | The force exerted by air on the area below it | 2 | |
| 9821564850 | Troposphere | The lowest layer of the atmosphere, the one directly above the ground | 3 | |
| 9821564851 | Stratosphere | The layer of the atmosphere above the troposphere | 4 | |
| 9821564852 | Ozone Layer | Ozone is concentrated in a portion of the stratosphere | 5 | |
| 9821564853 | Mesosphere | Above the stratosphere, the layer that extends 50-80 kilometers above sea level | 6 | |
| 9821564854 | Thermosphere | The top layer, which begins about 80 kilometers above Earth's surface and extends upward into space | 7 | |
| 9821564855 | Radiation | The transfer of energy through space | 8 | |
| 9821564856 | Conduction | The transfer of heat directly between two objects that are in contact with one another | 9 | |
| 9821564857 | Convection | The transfer of heat by the movement of currents within a fluid | 10 | |
| 9821564858 | Convection Current | a current caused by the rising of heated fluid and sinking of cooled fluid | 11 | |
| 9821564859 | Air Mass | A large body of air | 12 | |
| 9821564860 | Front | The boundary between air masses that differ in temperature and moisture | 13 | |
| 9821564861 | Air Pollution | The release of damaging materials into the atmosphere | 14 | |
| 9821564862 | Emissions | Pollutants that are released into the air | 15 | |
| 9821564863 | Fossil Fuels | Carbon-containing fuels that formed millions of years ago from the remains of living things | 16 | |
| 9821564864 | Primary Air Pollutant | Pollutants released directly into the troposphere | 17 | |
| 9821564865 | Secondary Air Pollutant | Harmful products produced when primary air pollutants react chemically with other substances | 18 | |
| 9821564866 | Smog | An unhealthy mixture of air pollutants that may form over cities and nearby areas | 19 | |
| 9821564867 | Temperature Inversion | The condition in the troposphere in which a layer of cooler air lies beneath a layer of warmer air | 20 | |
| 9821564868 | Acid Deposition | caused by sulfuric and nitric acids resulting in lowered pH of surface waters, also called acid rain | 21 | |
| 9821564869 | Clean Air Act | Protects and improves the quality of air in order to safeguard human health and the environment. | 22 | |
| 9821564870 | Catalytic Converter | A device in a motor vehicle that reduces the amount of air pollutants in emissions | 23 | |
| 9821564871 | Scrubber | Removes pollutants or changes them chemically before they leave factory smokestacks | 24 | |
| 9821564872 | Ozone Hole | The area of lowered concentration over Antarctica that occurs every year from August until October | 25 | |
| 9821564873 | Chlorofluorocarbons (CFCs) | A family of chemical compounds containing chlorine, fluorine, and carbon. | 26 | |
| 9821564874 | Montreal Protocol | Issued in 1987, it was a treaty requesting ozone substances to become depleted | 27 |
