Word: core
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Dates: during 1960-1969
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Most of the earth's material is plastic enough to contract evenly, but the thin surface crust is rigid. Instead of contracting smoothly when the core shrank, it cracked and wrinkled, just as in the old theory. Sometimes parts of the earth's crust slid over other parts like sheets of ice in a fast-flowing river. These surface irregularities, much changed by erosion, are the earth's mountains...
Lyttleton figures that the earth's compressible liquid core, which can be studied by means of earthquake waves, has caused the earth to shrink about 400 miles in diameter. Some 20 million square miles of crust have been tucked away in mountainous folds and wrinkles. How long this process will continue, Lyttleton does not know. But mountains are still rising, and Lyttleton estimates that if the entire earth were to liquefy, it would lose another 50 miles of diameter...
...moon and Mars, Lyttleton calculates, are too small to have liquid cores, and this may be why neither of them has mountain ranges. But Venus is about the same size as the earth, is probably made of much the same material, and it may have a shrinking liquid core. As man's space probes continue to study the distant planet, they may discover that it has a pattern of wrinkled, earth-type mountains hidden under its cloud deck...
...this pleasant pavilion is Architect Minoru Yamasaki, a wiry, 132-lb. Nisei who was born 50 years ago in a slum less than two miles from where the Science Pavilion now stands. In manner, he is the most courteous of men, often humble to a fault. But the core of the man is all steel, tempered not only by the anti-Nisei discrimination he has known, but also by his often lonely fight to reintroduce into architecture the embellishments that many modern architects tend to despise...
...workers on temporary layoffs, people who have quit their jobs in search of higher pay and teen-agers looking for holiday work, the Labor Department arrives at an unemployment rate far higher than it would be if the U.S. switched to the European system of counting only the hard core of long-unemployed adults. But the number of adult U.S. men who have been out of work for 15 weeks or more still stands at 1,000,000. And the figures might be even larger had not so many potentially employable Americans given up looking for jobs in the past...