Terms : Hide Images
| 5822063744 | atmosphere | A mixture of gases that surrounds a planet or moon. |  | 0 |
| 5822063745 | relative humidity | The amount of water vapor in the air at any given time is usually less than that required to saturate the air. Expressed as a percentage. |  | 1 |
| 5822063746 | air pressure | The measure of the force with which air molecules push on a surface |  | 2 |
| 5822063747 | troposphere | The lowest layer of Earth's atmosphere |  | 3 |
| 5822063748 | stratosphere | The second-lowest layer of Earth's atmosphere. |  | 4 |
| 5822063749 | ozone layer | Protective layer in atmosphere that shields earth from UV radiation. |  | 5 |
| 5822063750 | mesosphere | The layer of Earth's atmosphere immediately above the stratosphere, 3rd layer of the atmosphere. |  | 6 |
| 5822063751 | thermosphere | The uppermost layer of the atmosphere, in which temperature increases as altitude increases, 4th layer of the atmosphere |  | 7 |
| 5822063752 | radiation | Energy that is radiated or transmitted in the form of rays or waves or particles. |  | 8 |
| 5822063753 | conduction | Form of heat transfer where heat energy is directly transferred between molecules through molecular collisions or direct contact. |  | 9 |
| 5822063754 | convection | The movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat. |  | 10 |
| 5822063755 | convection current | the movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another |  | 11 |
| 5822063756 | air mass | A huge body of air that has similar temperature, humidity, and air pressure at any given height |  | 12 |
| 5822063757 | front | The boundary between two air masses |  | 13 |
| 5822063758 | air pollution | Concentration of trace substances such as carbon monoxide, sulfur oxide, hydrocarbons, and solid particulates, at a greater level than occurs in average air. |  | 14 |
| 5822063759 | emission | the production and discharge of something, especially gas or radiation |  | 15 |
| 5822063760 | fossil fuel | Coal, oil, natural gas, and other fuels that are ancient remains of plants and animals. |  | 16 |
| 5822063761 | primary air polluant | Enters the atmosphere, with chemicals in the air to form secondary pollutants | 17 | |
| 5822063762 | secondary air pollutant | formed by reaction of primary pollutants. |  | 18 |
| 5822063763 | smog | air pollution by a mixture of smoke and fog |  | 19 |
| 5822063764 | temperature inversion | atmospheric condition in which warm air traps cooler air near the earth's surface |  | 20 |
| 5822063765 | acid deposition | Sulfur oxides and nitrogen oxides, emitted by burning fossil fuels, enter the atmosphere-where they combine with oxygen and water to form sulfuric acid and nitric acid-and return to Earth's surface |  | 21 |
| 5822063766 | clean air act | Set emission standards for cars, and limits for release of air pollutants |  | 22 |
| 5822063767 | catalytic converter | a device that reduces carbon monoxide emissions from vehicles. |  | 23 |
| 5822063768 | scrubber | devices containing alkaline substances that precipitate out much of the sulfur dioxide from industrial plants. |  | 24 |
| 5822063769 | ozone hole | A thinning of stratospheric ozone that occurs over the poles during the spring |  | 25 |
| 5822063770 | chlorofluorocarbon | A gas used as a solvent, a propelant in aerosols, a refrigerant, and in plastics foams and fire extinguishers. |  | 26 |
| 5822063771 | montreal protocol | phase out of ozone depleting substances. |  | 27 |
