Word: layers
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These finer particles remained suspended, drifting into a globe-enveloping shroud that blocked sunlight for months before blanketing the earth in a layer of dust. In the cold and dark, photosynthesis ceased, plants and animals died, and entire species, including the dinosaurs, perished...
...search for the Crater, the first clues were sifted out of clumps of gray clay. At dozens of sites around the world, that clay has been found in a thin boundary layer between the rock of the Tertiary period and the formations of the late Cretaceous period, which ended 65 million years ago. In the Cretaceous rock lie the fossil remains of giant dinosaurs and a profusion of other species. But in the Tertiary formations, just above the clay, no trace exists of the dinosaurs or many of the other Cretaceous species...
When Derek C. Bok took office in 1971, he seriously considered appointing a provost. Eventually, Bok decided against it, fearing that it might simply create an unnecessary layer of bureaucracy...
Ironically, the Meme and Replicon implants, which are actually no different from ordinary silicone implants except for an added layer of polyurethane foam, were considered by many surgeons to be the best on the market. The older, smooth-shelled variety tended to cause surrounding tissue to tighten into a fibrous mass, sometimes leaving the breast misshapen and hard to the touch. But the polyurethane foam coating of the Surgitek products prevented this from happening by substantially increasing the surface area of the implant. When the neighboring tissue contracts, it does not become too compact. Surgeons who have used the models...
Some scientists and officials feel the EPA may be overstating the case. Robert Watson, an ozone expert at NASA, commended the study in general but questioned the skin-cancer predictions, noting that the ozone layer still seems to be intact during the summer months, when most cases of skin cancer originate. Some critics also pointed out that Reilly may have timed the release of the report to rally public support for the environment one week before the National Academy of Sciences is scheduled to release a major paper on what the U.S. should be doing about global warming. The issue...