Word: layering
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Dates: during 1980-1989
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...particularly in stagnant waters. The exact reasons for these spurts of algal growth are unknown. They can be triggered, for example, by extended periods of sunny weather following heavy rains. Scientists believe algal growth is speeded up by the runoff of agricultural fertilizers. The burgeoning algae form a dense layer of vegetation that displaces other plants. As the algae die and decay, they sap enormous amounts of oxygen from the water, asphyxiating fish and other organisms...
...tent at one of four 200-man compounds in Ansar's Camp B, which constitutes one-third of a canvas village that sprang up on the desert plain three miles from the border with Egypt. By day the men loll on wooden pallets that are cushioned by a layer of foam and a rough gray blanket. At night prisoners are required to retire to their tents, close down the side flaps of their dwellings by 9 p.m. and not come out until reveille at 5:30 the next morning...
Describing the core of the earth is no mere academic exercise. Understanding earthquakes, volcanoes and other geological phenomena depends largely on fathoming the forces at work within the planet's mantle, the thick layer of rock that stretches from the core to within an average of 30 miles of the surface. The behavior of the mantle seems to be determined by the core. The molten center also acts as an electromagnetic dynamo, creating the magnetic field that shields earth from the high-energy particles that stream from...
...other shoe had to drop sooner or later. For five years, atmospheric scientists have known that a 3,000-mile hole in the ozone layer develops over Antarctica during the southern spring. The phenomenon is dramatic evidence of ozone loss in the upper atmosphere, caused largely by man-made chemicals called chlorofluorocarbons, which could leave the earth more vulnerable to cancer-inducing rays from the sun. Now, it seems, there is mounting evidence that the Arctic has its own ozone hole, albeit a smaller one. At the American Geophysical Union meeting last week in Baltimore, W.F.J. Evans, an atmospheric physicist...
Congress rushed to fund research on synthetic fuels and fusion and raised the mandatory fuel efficiency standards for new cars. Advertisements urged us to add a layer of insulation to our attic, turn down our thermostats and avoid driving to conserve energy. The oil shortage created an intense awareness that we must conserve fuel and find new sources of energy to ensure that our supply of energy could fulfill future demands...