Word: crusts
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Puzzling Boulder. Scientists were equally pleased. Even before the astronauts returned, astronomers at McDonald Observatory in Texas reported that they had managed to bounce laser beams off the newly placed corner reflector at Fra Mauro; such experiments may provide valuable clues to the movements of the earth's crust and the slight wobble of the globe (see following story) as it spins on its axis. The rest of the $25 million package of experiments deployed by the astronauts also performed extremely well under unusually trying circumstances; four days after the instruments were set up in the lunar highlands, there...
...crust itself is probably relatively thin. But during differentiation, the tug of terrestrial gravity would probably have pulled more dense material to the side of the moon facing the earth. As a result the crust there would have been slightly squeezed and become thinner than that on the far side. Indeed, such an uneven distribution of crust was offered by University of Chicago Mineralogist Joseph Smith to explain the paucity of maria on the far side. These great lunar seas are believed to be vast upwellings of lava, perhaps from volcanic eruptions set off by the moon's collision...
...being satisfactorily explained for the first time. Most scientists finally agree, for example, that the continents-which look as if they once fitted together like a giant jigsaw puzzle-indeed broke off from one or two immense land masses along volcanically active cracks in the earth's crust known as mid-ocean ridges. Part of this undersea mountain chain, which girdles the earth like stitching on a baseball, has now been identified as the prime suspect in still another major geological mystery: the raw and atypical terrain of the American West...
...eventually met up with another segment of the ridge system called the East Pacific Rise. But the moving continent did not stop at this natural barrier; instead it bulldozed right over it. As a result, the West now sits smack atop this hot seam in the earth's crust...
...American cook. The book's highlight is a 50-page section on making genuine French breads with all-purpose American flour. The basic process takes seven hours at the very least. But anyone who perseveres will be rewarded by the characteristic chewy loaf with the crackly crust that Frenchmen can acquire for a two-minute trip to the local boulangerie. Other lengthy sections in Julia II deal with the production of charcuterie (sausages) and puff pastry...