Word: layers
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...Besides revealing much about the moon, the core may provide an intriguing record of the activities of the sun. Has it suddenly flared up during the past few billion years? Have its fires ever diminished? By studying the microscopic tracks left by the bombardment of cosmic rays in each layer of the core, and by looking for traces of an element like argon-which is blown from the sun to the moon in the stream of particles known as the solar wind-scientists may eventually get their answers...
...long been the subject of scientific debate. While the rover's remote-controlled TV camera followed them with its big-brotherly eye, the astronauts walked slowly down the rille's gently sloping near side. On the almost vertical far wall, they spotted at least two major layers of material. Even more interesting to the scientists in Houston was the astronauts' report that the second major layer contained at least ten subordinate layers...
...much of the South Vietnamese military effort into conventional U.S. military forms. The whole Kennedy-McNamara-Johnson doctrine of slowly stepping up the levels of force was a failure. The enemy was always able to adapt and respond. The fantastic complexity of the U.S. command structure, the mystifying extra layer at Pearl Harbor, the tremendous logistical and bureaucratic component in our forces in Viet Nam -all of these deserve rigorous review. So do the American doctrines of airpower...
...moon is man-made). The level volcanic seas or mares of the Apollo 11 and 12 landing sites cover much of the near side of the moon and provided the first lunar samples. Here the volcanic bedrock has been repeatedly hit by meteorites and broken up so that a layer of broken rock and dust from 6 to 20 feet deep lies on the surface. Some of these rocks have been lying on the surface directly exposed to space for several million years, while the top inch of soil has been relatively unmixed for the last several hundred million years...
Dutcher feels that the most important factor in motorcycle racing is tire preparation. "Racers use softening compounds on the tires and then file and rasp the edges to get maximum contact with the racing surface," he explained. "The track gets much faster during the race as a layer of rubber melts onto the surface...