Word: crusts
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Dates: during 1960-1969
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...large underground tests could conceivably poison the water supply of an entire state. For relatively small nuclear devices the U.S. is likely to continue underground tests, but the more powerful sod busters of the future will have to be tested in the open because the earth's crust cannot hold them. Former Atomic Energy Commissioner Willard F. Libby estimates that a ten-megaton test would need to be exploded 18 miles below the surface. At this depth the rock is probably so plastic that digging a test hole would be impossible. Another possibility is to fire tests above...
...winged, 6,000-ton concrete roof of his TWA terminal at Idlewild to his new Dulles International Airport at Chantilly, Va., with its moving waiting room-a daring, a willingness to experiment with form that few of his contemporaries had. "An architect must have a combination of sensitivity and crust," he said, and he had both...
...most accessible part of the earth's interior is at the ocean's bottom, where the crust is thin. Project Mohole, the U.S. attempt to reach the boundary layer between the earth's crust and mantle by drilling off the coast of Mexico, so far has penetrated only ordinary, surface-type rocks. Last week, the Woods Hole Oceanographic Institution reported far better success with another method. From the fractured north wall of the Puerto Rico Trench, its research ship Chain has dredged up the first samples of "third layer" rock ever gathered...
...Puerto Rico Trench is one of the most interesting places on earth. Lying north of Puerto Rico, it is something like the Grand Canyon sunk under three to four miles of water. Like other deep ocean trenches, it is believed to be a place where the earth's crust is sinking into the interior, perhaps carried down by slow, enormous currents in the plastic mantle. Since trenches are characteristic of the Pacific Ocean, where they abound, some geophysicists consider the Puerto Rico Trench a part of the Pacific that has bulged into the Atlantic between North and South America...
...manganese oxides that slowly deposit from sea water. Other surfaces were fresh and light green. Dr. John B. Hersey, chief scientist of the cruise, believes that the chunks with fresh faces were broken by the dredge out of the mysterious third layer. If so, they may show what the crust of the earth was like billions of years ago, before the infant ocean rained sediment...