Word: crusts
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Dates: during 1950-1959
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None of these happenings was supernatural. The village and its fields stand on a thin crust of soft clay over a vast labyrinth of caves and tunnels some 30 miles long where, since Roman times, men have undermined their homes by quarrying out the sandstone to build them. The quarries, abandoned in the 1900s, were put to new use in 1918 when Willem Heynen and other villagers discovered that the cave galleries had the ideal temperature and humidity for growing mushrooms...
...Clark University, Worcester, Mass., offered a new theory. At the Washington meeting of the American Association for the Advancement of Science, he argued that the glacier did not retreat, but stayed in place so long that its enormous weight pushed a giant dimple in the earth's crust. When the glacier finally began to recede, the dimple filled with water and became an inland...
When the glacier finally drew back toward Canada (about 23,000 B.C.), the unburdened crust began to recover, and the dimple flattened out. Ohio, Iowa, Michigan and Wisconsin rose out of the Leverett Sea. The broad estuary that led to the Gulf shrank to form the modern Mississippi...
Paul LeComte 7G described important experiments in the field of high-pressure physical geology under the direction of Francis Birch, Sturgis Hooper Professor of Geology, which are attempting to reveal the nature of unexplained structural discontinuities just below the earth's outer crust...
...thin, thin crust of laughter, mockery...