Word: layer
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Acoustica engineers explain that when a solid fuel burns in a high-pressure combustion chamber, the components, e.g., ammonium perchlorate and polystyrene, turn to gases that mix in a thin layer on its surface. Part of the heat generated strikes back to the fuel, gasifies more of it, and so keeps the flame burning. When this characteristic was discovered by Dr. Martin Summerfield of Princeton, the next step was to look for something that would control the gas mixture. A faster mixing would increase the burning rate, while slower mixing would decrease it. If the control were precise enough, scientists...
...recent discovery is evidence that an enormous volcanic eruption may have darkened the sky when man was in his stone-chipping stage. Cruising down the west coast of South America, Lament's Vema discovered a layer of clean white volcanic ash up to twelve inches thick. Other explorations have found layers of similar ash in many parts of the Pacific and Atlantic. Dr. Ewing suspects that all the ash came from a series of stupendous eruptions along the spine of the Andes, estimates the date as 68,000 years ago. It must have been a black time for paleolithic...
...front. "The music box played Silent Night," he remarks. "I fixed it to go 'ping, ting, click' instead." Prize exhibit in the Museum of Modern Art's "Recent Acquisitions" show last week was a Johns target, messily painted in red, blue and yellow atop a layer of old newspapers pasted to canvas. Attached to the upper edge of the canvas was a boxlike arrangement containing the lower parts of four faces, done in tinted plaster...
...increases suddenly at a certain level under the earth's surface (the depth varies from place to place). This suggested that the Moho marked a dividing line between different materials. Geologists believe that the Moho is the bottom edge of the granite and basalt that forms the lower layer of the earth's crust; under it is the earth's mantle consisting of a mixture of silicates and nickel-iron, which in turn encloses the nickel-iron core...
...Moho to an impossible depth. The best place to drill is the floor of the great ocean basins. The floor may be three miles beneath the ocean's surface, but the Moho lies only three or four miles deeper, under a thin skin of sedimentary deposits and a layer of basalt...