| A | B |
|---|
| atmopshere | the layer of gases hundreds of kilometers thick that surrounds the Earth |
| smog | a type of air pollution that is visible as a smokelike haze |
| ozone | a gas that absorbs some of the harmful radiation from the Sun |
| troposphere | the lowest layer of the atmosphere |
| troposphere | layer of the atmosphere that contains 75% of all gases |
| troposphere | layer of the atmosphere in which we live |
| troposphere | layer of the atmosphere in which weather occurs |
| stratosphere | 2nd layer of the atmosphere |
| stratosphere | layer of the atmosphere that contains the ozone layer |
| stratosphere | layer of the atmosphere containing the jet streams |
| mesosphere | the middle layer of the atmosphere |
| mesosphere | layer of the atmosphere where the space shuttle and space station are |
| ionosphere | area of the atmosphere which reflects radio waves back to Earth |
| thermosphere | 4th layer of the atmosphere |
| thermosphere | hottest layer of the atmosphere |
| thermosphere | layer of the atmosphere that contains meteors, satellites, and auroras |
| exosphere | outermost layer of the atmosphere |
| exosphere | blurred boundary with outer space |
| outer space | no air at all |
| atmospheric pressure | the measurement of the weight of the air |
| barometer | instrument which measures the atmospheric pressure |
| wind | motion of air parallel to Earth's surface |
| weather | the condition of the atmosphere at a given place and time |
| climate | weather conditions in an area over a long period of time |
| wind | motion of air parallel to Earth's surface |
| precipitation | wind, snow, sleet, or hail |
| doldrums | calm wind areas along the equator and about 30 degrees N and S latitude |
| trade winds | winds in the low latatudes that blow from the east |
| prevailing westerlies | winds in the middle latitudes that come from the west |
| Coriolis effect | deflection of global winds by Earth's rotation |
| orographic effect | an effect of mountains on climate which produces moisture on the windward side and dry or on the leeward side |
