Word: sediments
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Dates: during 1970-1970
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...site themselves, Tidwell and his colleagues found two more fossilized palm logs. Near by, in the same geological formation, an oil company discovered ancient palm pollen. Other scientists, highly skeptical of the purported age of these finds, contended that they could easily have been washed down into the older sediment from higher and younger geological formations...
...Social Sediment. The Untouchables are castoffs from one of the world's most rigid social orders. Around 1500 B.C., according to many scholars, fair-haired Aryan invaders formalized the four-tier Hindu caste system and introduced a color factor.*The tiers soon evolved into economic strata, and by 500 B.C. a fifth level had been established for Atisudras, or Untouchables. The fifth stratum, peopled by the hated and despised children of intercaste marriages and the lowest laborers, became...
India's social and economic sediment...
...biologist, Alain Bombard, says that the sea can handle human sewage. "But," he adds, "this process of purification is easily and seriously disrupted by the introduction of the chemical byproducts of civilization." Near Marseille, a pair of big aluminum refineries each day discharge 6,000 tons of a red sediment into the Mediterranean. Though 80% of it funnels into a deep submarine trench, the remainder settles elsewhere on the bottom. "The problem," says Bombard, "is that this waste, though not toxic in itself, blankets and kills all living things. Moreover, this is an area where it is essential to have...
...small cost. A surprisingly low $3 billion is all it would take if plants and factories were required to install waste-treatment facilities sufficient to meet existing water standards. A total of only $2 billion would pay for cooling towers to prevent thermal pollution, and $6 billion would bring sediment and acid mine drainage under control. The price of eliminating industrially caused air pollution is somewhat higher because the job must be done on a regular basis. Estimates are that it would cost $600 million a year to curb the sulfur dioxide emitted from power plants and another $100 million...