Word: sediment
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...thinks, is for a slow current in the earth's plastic mantle to start flowing horizontally and then curve downward (see diagram). Where it makes the dive, it drags down a strip of the crust, forming a V-bottomed trench which after many millions of years fills with sediment. Eventually the downward current in the mantle stops flowing. Since the mantle rock at its sides is heavier, it moves in, forcing upward the dragged-down crust and the sediments in the trough. Final result is that the former trench pokes above the sea, appearing as an arc of islands...
Mysterious Trenches. An ocean-bottom problem that fascinates all oceanographers is the origin of the deep troughs that are found mostly in the Pacific. The deepest ones, e.g., the Tonga Trench, the Marianas Trench, have narrow V bottoms that are clear of sediment. They are uneasy parts of the earth's crust. Deep-focus earthquakes rumble out of them, and generally volcanoes spout near...
...Civil Engineers honored, with a prize for outstanding research, University of California Professor Hans Albert Einstein, 54, son of Physicist Albert. Engineer Hans's contribution to science, more down-to-earth than his late father's famed E = mc2 formula, was "to the knowledge of transportation of sediment in flowing water...
...room, the fragments are prepared for mounting. Those too brittle to be uncurled are placed in a humidifier until they are pliable enough to be pressed flat. Then they are cleaned of sand, mold and marl (a clayey sediment) with fine camel's-hair brushes, sometimes dipped in castor oil. Some are so delicate that special brushes of only a few hairs must be used; and these fragments bear warnings-Don't Touch or, occasionally, DON'T BREATHE...
...decomposition were noted. By this week it was clear that Rivera's mural was a wash out. Mexico's National Restoration Institute, after six months of vain attempts to save it, announced that it was abandoning the rapidly deteriorating mural to the ravages of running water and sediment. Rivera, in seclusion in Acapulco, was unavailable for discussion of the decision. But old rival and fellow Communist, David Siqueiros, was glad to oblige: "When Diego started painting this mural, I told him that polystyrene, like any other paint, was not going to resist water for even two years...