Word: layering
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...most parts of North America the warm, smoggy air would continue to rise and the winds would disperse it. But Los Angeles' upper air, instead of getting progressively cooler at higher levels, has a peculiar temperature inversion. There is a warm layer, usually at 1,000 to 3,000 ft., which sits on the smog. Prevailing winds from the Pacific High cannot readily blow the heavy cloud away to the east because of the mountains which half ring the city...
With low-hanging stratus (i.e., solid layer) clouds, Project Cirrus was just as successful. Langmuir told how the planes had drawn Greek letters and "racetrack" patterns in stratus clouds by dropping small amounts of dry ice (see cut). Sometimes the cloud was dissipated so completely that blue sky showed through the gaps. Langmuir believes that dry ice can be used to clear clouds from over airports...
...deny Stalin's arrant opportunism. What he shows is that Stalin and the world Communist Party guide their main course on the basis of a hard core of theory, and have done so for 25 years with "amazing consistency." Around the hard core of theory is a hard layer of what Stalin calls program. Around this is a layer of strategy, then an outer husk of tactics...
...Edward Victor Appleton has spent most of his 56 years with his head in the clouds. He has accomplished a lot up there. "The ionosphere," a colleague once said of Sir Edward, "is his playground." He proved the theory that the earth is circled by electrically charged layers in the upper atmosphere, came to know more about them than any man alive (there is an Appleton layer, usually about 140 miles above the earth*). His researches made possible the development of radar, won him a knighthood and the 1947 Nobel Prize in physics...
...Appleton layer reflects certain radio waves around the earth. Sir Edward's experiments proved the possibility of round-the-world broadcasting...