Word: crusts
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Dates: during 1970-1979
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...moon is revealed by the different types of rock found there. Most of the rocks brought back from the lunar seas by Apollo 11 and 12 are titanium-rich basalt and gabbro. They appear to be once-molten lava from inside the moon which broke through the crust made of lighter anorthosite and crystallized to form the seas about 3.5 billion years...
...crust itself forms the lunar highlands and was crystallized about 4.5 billion years ago-about the same time the earth was formed. Recent Apollo 14 samples from the highlands are anorthositic and support the hypothesis of an anorthosite crust...
...slopes, hoping to learn more about the processes at work inside the mountain. Most volcanoes lie near the meeting place of the massive, slow-moving plates that are believed to make up the earth's outer shell. Their crunching movements apparently cause cracks in the earth's crust that enable hot material known as magma to escape in the form of lava. Many scientists think that Etna was created by the meeting of the African and European plates...
...hard crust of skepticism has formed on the imaginations of Wall Street analysts since the days when mere mention of "uranium," "transistor" or other buzz words could send a stock's price skyward. A new term, however, is having that effect today: soft contact lenses. Within six weeks after officers of Bausch & Lomb, a 118-year-old optical manufacturer, enunciated the words in March, their stock had nearly doubled. Competitors have said that they will market a soft contact lens, too, with similarly salutary results...
...Vietnam; he began work on the study as early as December 1968. In the months preceding the study, the military state of affairs in Indo-china had been the subject of a raging controversy inside the various departments. The outgoing Presidential advisors and the upper crust of Washington's foreign service were claiming that the NLF had grown significantly weaker since the Tet offensive the previous February, that the Communist military campaign would fold in a matter of months. But the lower echelon-often closer to the truth than were their superiors-said rightly that the guerrillas were merely regrouping...