Word: layering
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Scientists generally agree on the basic cause of lightning: the buildup of enough voltage, or electrical potential, between clouds and earth (or be tween different clouds) to overcome the resistance of the insulating layer of air between them. The buildup occurs when electrons, perhaps carried by falling water droplets, migrate to the bottom of a cloud, giving it a strong negative charge. Because like charges repel, that negative charge drives away electrons in the ground below, leaving it with an excess positive charge. Eventually, the voltage between cloud and ground becomes so great that electrons burst across the insulating...
Immediately after Harden stripped away the outer layer of paper from the package, a sealed letter--which was not opened yesterday--"on the Sacco-Vanzetti case," addressed to "Sir Horace Plunkett" tumbled...
Exploration crews have been probing the Tuscaloosa Sand since the early 1960s, but the gas proved elusive. Formed 65 million years ago in northern Louisiana and swept southward by ancient rivers, it lay hidden under a layer of limestone that distorted the echoes of shock waves by which geologists map underground formations. But a Chevron geologist's hunch, confirmed by tests using computer techniques, led prospectors to a swampy field on the Parlange plantation. When the drill bit spun into a zone of extreme pressure 21,345 ft. down, the gas and steam crushed the well casing, ripped...
...weeks beginning Nov. 24, and a brand-new press club was to be specially opened for Carter's arrival. The government of Edward Gierek had high hopes that the visit would produce tangible benefits in trade and other economic exchanges. In Brazil, the change of plans added a layer of glare ice to an already chilly relationship. The Brazilians had hoped that Carter's visit would ease tensions-centering on nuclear proliferation and human rights-between the two countries. Carter created another kind of scheduling problem for himself in Paris. Unless he can cash his rain check...
Interpreting these finds requires even more skill. The age of a fossil can often be determined by analyzing the layer of rock or soil in which it was found and determining, often by the so-called potassium-argon method, just how old the layer is. Interpreting the messages of the fossil is usually more difficult. ; The first step in studying a fossil, ; which is often fragmented, is to separate -it from its rock or soil matrix. Next the ! fragments are assembled, a task considerably harder than putting together a jigsaw puzzle with pieces all the same color...