Word: layers
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...across our borders to alter the economic and political life of cities and states from New York to California. Decisions by oil ministers in distant continents can affect our standard of living and endanger our economic prosperity. An epidemic of AIDS in Africa or a hole in the ozone layer over the Arctic threatens the lives of Americans all across the land...
...America. We fear the consequences of forcing South Africa to reform its system or insisting that Brazil or Argentina pay their debts on time. As the years pass, more and more issues will arise that require the collective efforts of many nations--acid rain, the destruction of the ozone layer, the traffic in drugs, and many more. Such problems will create increasing pressure for cooperative rather than unilateral decisions...
Fifteen years ago, scientists began noticing that the earth's protective ozone layer was being depleted by a group of chemicals known as chlorofluorocarbons. They warned that deterioration of the ozone, which blocks the sun's harmful ultraviolet rays, could lead to an increase in skin cancer and disastrous climatic changes, including an overall warming of the earth's atmosphere...
Some astronomers are in less of a hurry, figuring that the best is yet to come. Says Woosley: "Once the photosphere ((the supernova's luminous surface layer)) is gone, that's when it gets interesting." When that shell thins out, months or years from now, astronomers will be able to look inside and "see" the newly born, rapidly spinning neutron star, but with a radio telescope rather than the optical kind...
Earliest man lived in these landscapes, among such animals, among these splendid trees that have personalities as distinct as those of the animals: the aristocratic flat-topped acacia, the gnarled and magisterial baobab. Possibly scenes from that infancy are lodged in some layer of human memory, in the brilliant but preconscious morning...