Word: layers
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Dates: during 1970-1979
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...large part of the controversy over the British-French Concorde arises from concern about the big jets' effect on the ozone layer, which protects life on earth from lethal doses of ultraviolet light. Laboratory tests and chemical theory have shown that the nitrogen oxides given off by jet engines destroy ozone. Do nitrogen oxides have the same effect in the stratosphere? A Dutch meteorologist working at Boulder, Colo., reports there is now evidence that the answer...
These results show the need for further research into the effects of technology on the ozone layer. Large solar flares occur infrequently, allowing the ozone layer time to be replenished by natural processes. But man's assaults on the ozone shield, in the form of SST flights, aerosol sprays and other chemicals, are continuous and could permanently deplete the layer...
...different study by Crutzen and three other scientists emphasizes the importance of the ozone layer. Researchers have been able to correlate the disappearance of certain species of animals and plants with periods when the earth's magnetic field was reversing. At some point during the reversal, the field virtually disappears, allowing solar particles that are normally deflected by the magnetic field to strike the earth. Some scientists have suggested that during these periods high-energy cosmic rays and particles from solar flares may have killed off entire species and caused extensive mutations in others...
...paper published in Nature, G.C. Reid and I.S.A. Isaksen of NOAA, T.E. Holzer of NCAR and Crutzen suggest that the solar particles may not directly wreak their havoc on life during magnetic field reversals. Instead, unobstructed by the field, they may deplete the ozone layer by as much as 50% by creating nitrogen oxides, letting in lethal doses of ultraviolet light...
Monk begins her solo huddled on a stool--an old, old woman in white leggings and frock. Traveling down a long white cloth, she journeys backwards in time. Her gestures compact layer upon layer of implied meaning. Wide-armed swaying conjures up the image of a little girl dancing to the hypnotic rhythms of her favorite ditty, but suggests too an ancient woman casting nets, sowing grain, soothing a child...