Word: rio
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Dates: during 1960-1969
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...bright; at 6 ft., there is no light at all. Reason: unlike the Amazon's clear-water tributaries, the river does not originate primarily in mountains and course through relatively narrow channels, but flows sluggishly across flatland. jungle and swamp areas. Each year at flood stage the Rio Negro overflows its banks, while draining some 253,000 sq. mi. - an area almost as vast as Texas. In the process, its waters dissolve untold quantities of plant juices and tree sap. Now scientists have discovered that the Rio Negro's botanically infused waters may be a simple, untapped...
Brazil's Rio Negro, one of the Amazon's main tributaries, is truly black...
...fulfill a longstanding six-week commitment to serve as senior scientist aboard the Alpha Helix, a sophisticated research vessel operated by California's Scripps Institution of Oceanography. From Manaus, Williams headed the Alpha Helix upstream for the expedition's shore camp at the confluence of the Rio Negro and the Rio Branco. The Negro, at high-water level during this time of year, "looked like Chesapeake Bay," says Williams. Along the shore, trees and plants were steeped in 30 ft. of the river's opaque water. As the Alpha Helix moved along looking for a landing site...
Williams quickly hypothesized tint the Rio Negro might in effect be an immense tea, pontaining infusions of plant and tree substances similar to the insect hormones. Scooping up the dark river water, Williams and his colleagues, Professors Fotis Kafatos of Harvard and David Prescott of the University of Colorado, freeze-dried and boiled the water to concentrate the chemicals in it, extracted them with solvents, then injected the resulting solution into immature cockroaches. Sure enough, the roaches all died without reaching sexual maturity...
...Eburnean area. According to Bullard, if the South American bulge had once fitted under the bulge of Africa, the continuance of the delineation between the two rock regions would be found running southwest through Brazil from a point near the city of Sao Luis 2,070 miles north of Rio...