Word: sun
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Dates: during 1990-1999
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...TERM "greenhouse effect" is used to represent the accumulation of trace gases in the atmosphere. These gases prevent the release of the sun's radiation back into space and trap the heat in the earth's atmosphere, leading to global warming. Without greenhouse gases like water vapor and carbon dioxide, our planet would reach a much lower average temperature and would be unable to support life as we know...
Does Harvard sit at the center of the universe after all? Do the sun and the moon follow the registrar hither and thither? (And does Congress? Is that why Martin Luther King's birthday comes so neatly sandwiched right where it doesn't count...
...snow never melts and has accumulated for centuries, 98% of Antarctica is permanently covered by a sheet of ice that has an average thickness of 2,155 meters (7,090 ft.). That accounts for 90% of the world's ice and 68% of its fresh water. Although the sun shines continuously in the summer months, the rays hit the land at too sharp an angle to melt the ice. At the South Pole, the average temperature is -49 degrees C (-56.2 degrees F) and the record high is -13.6 degrees C (7.5 degrees F). During the . perpetual darkness of winter...
...territorial conflict, but scientific cooperation intervened. It took the form of the International Geophysical Year, actually 18 months long, which was scheduled to take advantage of the peak of sunspot activity predicted for 1957 and 1958. Sixty-seven countries joined in this exhaustive study of the interactions between the sun and earth. Much of the research went on in Antarctica, where Argentina, Australia, Belgium, Chile, France, Britain, Japan, New Zealand, Norway, South Africa, the U.S. and the Soviet Union established bases...
Lemonick's ten-day visit to the starkly beautiful continent gave new meaning to the phrase working round the clock. For one thing, the sun never sets there during the summer months, which in the southern hemisphere stretch from October to March. Says Lemonick: "At 3 a.m. it looked like high noon outside. I almost had to remind myself to sleep." Hopping helicopters carrying cargo to remote bases, Lemonick talked to dozens of biologists, geologists and other scientists. His most harrowing trip was a helicopter ride to the edge of an ice sheet 25 miles out in Ross Sound...