Word: layered
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Dates: during 1940-1949
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...bottom of an ocean or lake, the magnetic particles in it line up with the earth's magnetic field like tiny compass needles. When the silt hardens into rock, the magnetic particles are "frozen" so that they cannot move. The Carnegie scientists found that even when the rock layer is folded by geological forces, the magnetic particles keep their alignment, pointing accurately around the curves of the folds. Even in layers known to be 200 million years old, the rock keeps its magnetism...
Next step is to combine the three colored images in the eye of the viewer. The combining is done with two "dichroic mirrors": plates of glass with one surface covered with a thin layer of a colorless, transparent substance. Because of the special way in which this combination affects light of different wave lengths, each mirror reflects only one color. The other two colors pass right through...
...about why the earth has oceans and land, or why most of its high land masses are concentrated on one side, opposite the Pacific Ocean. If the earth condensed from gases or from meteorlike particles, as many theories have held, it should be smooth and symmetrical with a deep layer of water covering the whole surface...
After the iron had precipitated, the earth was a solid, fairly cool but basically unstable object. In its center was a ball of comparatively light rock. Around the rock was a thick layer of mixed iron and stone. Then came a very thin layer of stone. The whole great ball was smooth and symmetrical, with no land. Deep ocean covered the whole surface...
...T.W.A. plane at La Guardia Field last week stepped a bald, strong-jawed man carrying two tiny wooden boxes. Inside the boxes, carefully packed between a layer of mud and some wet weeds, were 200 tiny (¼-in. diameter) snails (Bullinus truncatus). The snails were heavily infested with larvae of the fluke Schistosoma haematobium, which burrows under the skin and travels through the bloodstream to nest in and around the bladder. The infestation causes Bilharziasis (a form of schistosomiasis), resulting in passage of blood in the urine. Half of Egypt's 19,000,000 people suffer from it; throughout...