首页
登录
职称英语
Since ancient times, the destructive effects of earthquakes on human lives a
Since ancient times, the destructive effects of earthquakes on human lives a
游客
2024-02-09
28
管理
问题
Since ancient times, the destructive effects of earthquakes on human lives and property have encouraged the search for reliable methods of earthquake prediction. This challenge remains and modern scientists continue to search for reliable methods to determine the time, place and intensity of individual quakes. One prediction technique involves an analysis of the recurrence(重现)rates of earthquakes as indicators of future activity.
Earthquakes are concentrated in certain areas of the world which are subject to constant movements of earth’s plates and it is in these areas that scientists focus their investigations.
This search for pre-earthquake phenomena has received particular attention. In contrast to the ancient Greeks and Romans, who relied on the crying of dogs as a warning sign, modern scientists have focused on physical evidence for a coming earthquake. Evidence of plate strain can be found by measuring relative movements, while chemical changes also offer signals for scientists.
Analysis of the changes in magnetic properties and conductivity(传导性)of rocks provides further data for prediction. The electrical and magnetic properties of crustal(地壳的)rocks are particularly sensitive to strain. The conductivity of crustal rock is determined by the degree to which the rock is soaked with fluid and the electrolytic properties of those fluids. Before large earthquakes, small fractures develop in rocks, which change the quantity of fluid present. These changes can be measured and provide useful data. However, similar changes in the fluid-bearing capacity of rock can occur as a result of other factors such as changes in the water table, and therefore this technique is not entirely reliable.
The ancient believe that the behavior of birds, cats and dogs provides evidence of inevitable earthquakes has recently been attended as a result of tests carried out in California. It has been shown that changes take place in the metabolic(新陈代谢的)rates of these animals correlate with subsequent seismic activity. It is assumed that the animals are sensitive to the seismic waves which precede major quakes. In zones where earthquakes are known to occur, improved construction techniques can significantly reduce the effects of seismic waves. If more accurate information regarding the time and intensity were available, governments could take even more effective measures to reduce the impact on human life, if, however, an entirely accurate prediction technique became available, there would be significant social and political implications. [br] Which of the following is used by modern scientists to indicate a coming earthquake?
选项
A、The crying of dogs.
B、The conductivity of rocks.
C、The changes in the water table.
D、The quantity of fluid in earth.
答案
B
解析
事实细节题。原文第三段首句说,对岩石的磁性和导电性变化的分析提供了更多的预测数据,故B)“岩石的导电性”为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3435028.html
相关试题推荐
[originaltext]Ancientman,livingincolderclimates,iscreditedwithmaki
[originaltext]Ancientman,livingincolderclimates,iscreditedwithmaki
[originaltext]Thewaterclockwasanancientclock.Itcouldbeusedonclo
[originaltext]TheOlympicGameswerefirstheldatOlympiainancientGreec
[originaltext]TheancientEgyptiansmademanyoutstandingcontributionsin
[originaltext]TheancientEgyptiansmademanyoutstandingcontributionsin
[originaltext]TheancientEgyptiansmademanyoutstandingcontributionsin
[originaltext]DuringthecivilizationofancientRome,thecircuswasabui
[originaltext]DuringthecivilizationofancientRome,thecircuswasabui
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
随机试题
Notuntilthisweekweretheyawareoftheproblemswiththeair-conditioningun
Hedidn’tfeelcoldthoughhewaswettotheskin.A、他不感到冷,虽然他湿透了。B、虽然他湿透了,但是他并不
[originaltext]I:Goodmorning,everyone.TodayI’dliketointroduceProfessor
买进股票组合的同时卖出相同数量的股指期货合约是()。A、买入套期保值B、跨期套利C、反向套利D、正向套利D担心未来价格上涨,买入股指期货合约为买
[originaltext]Fortwenty-fiveyears,Iwasafull-timethief,specializing
关于皮数杆的作用,下列中哪条是正确的?()A.保证砌体在施工中的稳定性 B
中国“三大木版年画”产地包括( )。A.天津杨柳青 B.河南开封朱仙镇 C
除哪项作用外,均为大黄的主要药理作用A.胃黏膜保护作用 B.镇痛作用 C
某施工人员在浇筑混凝土时随意加水导致了混凝土质量事故,此事故分类属于( )。
销售增长旺盛时期,公司新增核心流动资产和固定资产投资将超出净营运现金流,需要额外
最新回复
(
0
)