首页
登录
职称英语
Scientists say there has been a severe decrease in the amount of water in La
Scientists say there has been a severe decrease in the amount of water in La
游客
2023-10-21
61
管理
问题
Scientists say there has been a severe decrease in the amount of water in Lake Chad in northern Africa in the last thirty years. They reported that nature and humans share equal blame for this loss.
In 1963, the fresh-water lake covered 25, 000 square kilometers. Now the lake is only about five percent of that size. It measures only about 1, 300 square kilometers in the dry season.
Four nations surround Lake Chad. People in Niger, Nigeria, Chad, and Cameroon use it for water, fish and plant life.
Michael Coe and Jonathan Foley, water experts at the University of Wisconsin in Madison, reported on Lake Chad in a science journal. They say the area has suffered from a lack of heavy rain for more than thirty years. This has forced people to build systems to carry water to dry land. These irrigation systems further decrease the amount of lake water.
Mr. Coe says Lake Chad will be only a small body of water in the future. He says people still can get water from the lake to drink and for crops. But he says the lake will no longer provide a healthy environment for fish and plant life.
The researchers used a computer to study what caused the water loss. Their computer study estimated the climate and amount of water in the area. The estimate started with written records from the early 1960s. Then the researchers compared the estimates with the area’s recorded climate and water supply for the same period.
The computer study showed results similar to the recorded ones for the first twenty years. But there was a big change in the 1980s. At the time, the lake got smaller much faster than the computer research had estimated.
The researchers say that major irrigation systems were built in the 1980s. The systems took water from two rivers that flow into Lake Chad. The Chari and Logone rivers carry most of the water that enters the lake. The study showed that the increased irrigation reduced the flow in the two rivers. Climate changes also were responsible for the reduction. The flow of the two rivers was reduced by almost seventy-five percent.
Scientists say the problem is expected to worsen in the coming years as the population and demand for water continued to increase. [br] The amount of water in Lake Chad is______.
选项
答案
decreasing
解析
(文章第一段开头指出Scientists say there has been a severe decrease in the amount of water in Lake Chad.“科学家说乍得湖的水位严重下降”。)
转载请注明原文地址:https://tihaiku.com/zcyy/3117288.html
相关试题推荐
Theworld’sleadingclimatescientistshavesetoutindetailforthefirst
Theworld’sleadingclimatescientistshavesetoutindetailforthefirst
TheJapanesescientistshavefoundthatscents________efficiencyandreducest
ScientistssaytherehasbeenaseveredecreaseintheamountofwaterinLa
ScientistssaytherehasbeenaseveredecreaseintheamountofwaterinLa
ScientistssaytherehasbeenaseveredecreaseintheamountofwaterinLa
ScientistssaytherehasbeenaseveredecreaseintheamountofwaterinLa
In1964,asevereearthquakeoccurrednearAnchorage,Alaska.Itwasreportedto
Accordingtoscientists,youngpeople’stastebudsarenotreadyforthebit
________,themoreseverethewintersare.A、ThemorenorthyougoB、Thefarther
随机试题
PeopleinthemassadvertisingbusinessandotherswhostudyAmericansociet
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
如今大学生的生活方式正在发生着变化。越来越多的学生课余时间足不出户,变成了宅男宅女(indoors-manorindoorswoman)。网络为学生
Athirdoftheplanet’slandisseverelydegradedandfertilesoilisbeingl
以下不属于药品不良反应信息来源的是A.药品说明书B.报纸、杂志C.药品不良反应报
慢性阻塞性肺气肿病人最常见的酸碱失衡是A.代谢性酸中毒 B.呼吸性酸中毒 C
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
某项目采用经评审的最低投标价法评标,某投标文件商务和技术上满足招标文件的要求且
《工伤保险条例》规定,工伤职工或者其近亲属骗取工伤保险待遇的,将被责令退还,并处
(2015年真题)锅炉蒸汽管道的冲洗与吹洗范围,不包括()A.减温水管系统B
最新回复
(
0
)