Word: km
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Dates: during 1990-1999
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...Magellan spacecraft transmitted the most detailed pictures ever made of Earth's next-door neighbor. The radar images revealed a tortured topography with fault-like cracks in surprisingly regular patterns, craters as big as greater Los Angeles and volcanic mountains flanked by congealed rivers of lava at least 320 km (200 miles) long. Says James Head III, a Brown University geologist and member of the Magellan imaging team: "It's a revolutionary new view of Venus...
...intrusions. Far from being islands of primeval beauty, parks from Hawaii to North Carolina are being overrun with nonnative plants and animals, virtually all of them introduced, inadvertently or on purpose, by man. These "exotic threats" have become, officials say, the most serious danger facing the 323,750 sq. km (125,000 sq. mi.) national park system...
Some parts of the West will remain vulnerable with or without conservation. Southern California gets roughly half of its water from a single canal system, the California Aqueduct, which carries water from the Sacramento River Delta 800 km (500 miles) south to Los Angeles. Mark Reisner, author of Cadillac Desert, an examination of Western water, notes that the delta is sinking by as much as 7.6 cm (3 in.) a year, leaving the area, much of it already below sea level, ever more vulnerable to seawater intrusion. A major earthquake on the nearby Hayward fault could destroy the levees that...
Environmentalists also worry about how the electricity would get from the plant to Honolulu consumers, some 320 km (200 miles) away on the island of Oahu. Part of the plan calls for an undersea cable 222 km (138 miles) long, traversing the 1,920-meter-deep (6,300 ft.) Alenuihaha Channel. That would be the longest and deepest undersea electrical transmission line in the world. No one knows whether such a cable could operate reliably, nor whether its construction might harm the Cape Kinau nature reserve on Maui...
...largest ever race for vehicles propelled solely by power from the sun's rays. Built by science and engineering students from 32 American and Canadian colleges and universities, the innovative cars, capable of reaching speeds of up to 113 k.p.h. (70 m.p.h.), are following an 11-day, 2,639-km (1,640-mile) course that began in Lake Buena Vista, Fla., and will pass through eight states. The high-tech Soap Box Derby is scheduled to finish this week at the General Motors Technical Center in Warren, Mich., outside Detroit. (In case of extended rain, the race may be delayed...