Word: sediments
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Dates: during 1980-1989
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...cause of grass loss is an increase of sediment, which blocks the light that plants need in order to carry on photosynthesis. Another problem is the bay's excess of nitrogen and phosphorus. These nutrients "fertilize" the bay and promote the proliferation of algae. When algae decompose, they rob the water of its life-giving oxygen, killing the grasses and the creatures that depend on them. There are areas of the bay-submarine deserts-where nothing at all can live...
Today Sardis is the home of about 25 American and Turkish scholars each summer. They employ modern scientific methods in their research--sediment coring erosion and land use studies--as well as traditional methods of archaeological excavation and scholarly research. None of the antiquities can be taken out of Turkey, so photographs and records of the finds are sent to the U.S. while the more glamorous artifacts are deposited in a museum in the provincial capital of Manisa...
...recently shown a willingness to negotiate. Moreover, it is a sign to friend and foe alike that the U.S. is prepared to draw the line against the spread of Marxist-Leninist revolution. But as usual, covert action carries heavy risks. For one, the operation could prove unsuccessful, leaving a sediment of anti-American feelings. For another, the domestic debate over covert action is costing Reagan valuable political capital. The question now is whether the U.S. can sustain its covert operation long enough to wear down the Sandinistas or, failing in that, develop an overt response that will accomplish the same...
...bioaccumulation, poses a long-range, if not immediate, health hazard. Warned Adamkus: "This is going to be a ticking bomb for human beings if it is accumulated over the years." The sample fish in the study were bottom feeders, such as carp and catfish, which scavenge in slimy sediment, where dioxin tends to settle. Cautious environmental officials renewed warnings against eating fish from the Tittabawassee, though no outright ban has been declared. The exact health risk from dioxin absorbed by fish has not been determined...
...stuff but overrated, says Anita Harris, the geologist who guides McPhee through gaps, folds and sediment from Brooklyn to the dunes of northern Indiana. Harris reads old rock, both high and low, and she is not convinced that plate tectonics adequately explains a great deal of "suspect terrain." The whys and wheres of her disclaimers may not rivet the attention of readers whose geology begins on the front lawn and ends at the beach. But Harris' rigors of body and mind cannot fail to impress. She moves robustly over the landscape lugging her hammers and rock samples. She computes...