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南京文德托福:雅思阅读机经真题解析-探测陨石胡

时间:2018-07-25 17:10来源:南京文德教育 作者:南京文德教育 点击:
择要:小站雅思名师课堂从本日开始和各人分享一系列雅思阅读机经真题,是烤鸭在剑桥雅思之余的精采调度品。烤鸭们可以先本身试着做一做,做完之后可以对下谜底,

Detectionof a meteorite Lake

The project, led by earth sciences  professor Christopher Scholz of the College of Arts and Sciences and funded  by the National Science Foundation (NSF), is the first large-scale effort to  study Lake Bosumtwi, Earth’s surface. The resulting crater is one of the  largest an most well-preserved geologically young craters in the world, says  Scholz, who is collaborating on the project with researchers from the  University of South Carolina, the University of Rhode Island, and several  Ghanaian institutions. “Our data should provide information about what  happens when an impact hits hard, pre-Cambrian, crystalline rocks that are a  billion years old”, he says.

Before the researchers could explore the  lake’s surface, they need a boat with a large, working deck area that could  carry eight tons of scientific equipment. The boat-dubbed R/V Kilindi-was built  in Florida last year. It was constructed in modules that were dismantled,  packed inside a shipping container, and reassembled over a 10-day period in  late November and early December 1999 in the rural village of Abono, Ghana.  The research team then spent the next two weeks testing the boat and  equipment before returning to the United States for the holidays.

F

The reflected sound energy is detected by  underwater microphones-called hydrophones-embedded in a 50-meter long cable  that is towed behind the boat as it crosses the lake in a carefully designed  grid pattern. On-board computers record the signals, and the resulting data  are then processed and analyzed in the laboratory.” The results will give us  a good idea of the shape of the basin, how thick the layer of sediment are,  and when and where there were major changes in sediment accumulation,” Scholz  says, “we are now developing three-dimensional perspective of the lake’s  subsurface and the layers of sediment that have been laid down.”

H

Lake Bosumtwi, the largest natural  freshwater lake in the country, is scared to the Ashanti people, who believe  their souls come to the lake to bid farewell to their god. The lake is also  the primary source of fish for the 26 surrounding villages. Conventional  canoes and boats are forbidden. Fishermen travel on the lake by floating on  traditional planks they propel with small paddles. Before the research  project could begin, Scholz and his Ghanaian counterparts had to secure  special permission form tribal chiefs to put the R/V Kilindi on the lake.

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