Word: vapor
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Dates: during 1980-1989
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...gray-brown stains appeared in the azure skies above Los Angeles before the outset of World War I. During World War II, the summer haze was beginning to sting the eyes and shroud the mountains that ring the city. By the mid-'50s, Los Angeles' smog, as the noxious vapor had been dubbed, was sufficiently thick and persistent to wilt crops, obstruct breathing and bring angry housewives into the streets waving placards and wearing gas masks. Oil companies were urged to cut sulfur emissions. Cars were required to use unleaded gas, and exhausts were fitted with catalytic converters...
...inexhaustible. Not all solar power comes directly from the sun: both wind and hydroelectric power are solar, since wind is created by the sun's uneven warming of the atmosphere and since the water / that collects behind dams was originally rain, which in turn was water vapor evaporated by solar heating...
...already implemented or proposed initiatives to reduce smog in American cities, going back as far as the Clean Air Act 17 years ago. In the mid-1970s, catalytic converters on automobiles became mandatory. The Environmental Protection Agency has further advocated the use of methanol-based gasoline consumption and vapor recovery systems on cars and filling station pumps...
...part to answer such questions that the U.S. Viking 1 and 2 spacecraft, each consisting of an orbiter and a lander, were dispatched to Mars. When they arrived, 45 days apart, in 1976, cameras aboard the orbiters snapped away and remote-sensing devices searched for water vapor in the thin atmosphere and sought out frozen water in the polar ice caps. On the surface, the landers began providing the most accurate measurements yet of Martian surface temperatures, atmospheric density and wind velocity, while the cameras shot more than 4,500 spectacular close-up pictures of the surrounding, rock- strewn landscape...
...speculation among scientists on earth. Did the oxygen come from some tiny form of Martian life in the soil? After further tests failed to confirm those first results, scientists reluctantly concluded that the large amount of oxygen had probably been produced by a simple chemical reaction between water vapor and some unidentified oxygen-rich compound in the soil sample...