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
2023-07-06
59
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 belief that the behavior of birds, cats and dogs provides evidence of inevitable earthquakes has recently gained credence 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 which 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 lives. If, however, an entirely accurate prediction technique became available, there would be significant social and political implications. [br] Which of the following do modern scientists usually use to predict 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。定位句提到,与古希腊人和古罗马人把狗的叫声当作报警信号相比,当代科学家则集中精力收集震前的物理迹象。对岩石的磁性和传导性变化的分析提供了更多的预测数据,故B)“岩石的传导性”为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/2814085.html
相关试题推荐
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
Inviewofthepotentialsideeffects,pregnantwomenareadvised______(不要服用这种药)
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
随机试题
Weallknowwhatanadvertisementis;it’s【B1】______messagethatannounce
AGrassrootsRemedyMostofusspendourlivesseekin
[originaltext]EducationexpertssayAfrica’sgrowinghighereducationsyste
下图所示为()设计模式,适用于(请作答此空)。 A.有多个对象可以处理一个
大型项目可能包括一些超出单个项目范围的工作。项目范围是否完成以在( )中规定的
四十岁经产妇,近2年痛经并逐渐加重,伴经量增多及经期延长,届时需服强止痛药。妇科
()是消费者权益保护工作的最高决策机构,负责制定消费者权益保护工作战略、政
2002年6月到2007年6月,网民的年平均增长数约为()。A.1298
在共产主义社会,人们精神境界极大提高,每个人自由而全面的发展,对个人消费品实行“
根据下列国内生产总值表(单位:亿元)回答以下题。 社会总投资I的金额
最新回复
(
0
)