首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Since ancient times, the destructive effects of earthquakes on human lives and property have encouraged the search for reliable
Since ancient times, the destructive effects of earthquakes on human lives and property have encouraged the search for reliable
admin
2015-01-31
69
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 taking 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.
Crustal rocks can be used to predict earthquakes for their______.
选项
A、conductivity of electricity
B、sensitivity to strain
C、hardness to be cracked
D、magnetic properties
答案
B
解析
细节题。根据短文第三段第二句The electrical and magnetic properties ofcrustal rocks are particularly sensitive to strain.即外壳岩的电磁性对压力很敏感,由此可判断出答案为B。
转载请注明原文地址:https://kaotiyun.com/show/Zkq7777K
0
大学英语四级
相关试题推荐
AaronSwartz.thebrilliantyoungsoftwareprogrammerandInternetactivistwhoinspiredaweandreverence(尊敬)fromleadingfigur
AaronSwartz.thebrilliantyoungsoftwareprogrammerandInternetactivistwhoinspiredaweandreverence(尊敬)fromleadingfigur
HappinessandSadnessHappinessandsadnessaretwomostbasicandfamiliarfeelingsforhumanbeings.Recently,peoplehave
"Avoidtherush-hour"mustbethesloganoflargecitiestheworldover,whereveryoulookit’speople,people,people.Thetrai
Ifyouweretoldthataparticularlydelicious-lookingice-creamcone(圆筒)containeddangerouschemicals,thentoldsoonaftertha
Ifyouweretoldthataparticularlydelicious-lookingice-creamcone(圆筒)containeddangerouschemicals,thentoldsoonaftertha
AslongasAmericanslovetodrivefarandfast,electriccarsmayneverbetheperfectanswertothecountry’sgreentransporta
A、Theyhavebecomepopular.B、Theyarelikelytobemade.C、Theyareinusenow.D、Theywillnotbemade.B男士说人们还没有用纸制造飞机和轿车,但假以
UniversitiesBranchOutA)Asneverbeforeintheirlonghistory,universitieshavebecomeinstrumentsofnationalcompetitiona
随机试题
牵正散的组成药物是
下列关于领土主权取得方式和领土主权限制的判断中,符合现代国际法的是哪项:
城市是社会经济发展到一定阶段的产物。()
实施西部大开发“十一五”规划,着力改善基本公共服务,其措施有()。
根据国家统计局资料,2013年12月末,广义货币(M2)余额110.65万亿元,比上年末增长13.6%,狭义货币(M1)余额33.73万亿元,增长9.3%,流通中货币(M0)余额5.86万亿元,增长7.1%。12月末,人民币贷款余额71.9万亿元,人民币存
【2015.河北沧州】师德的灵魂是()。
根据下列资料,回答下列题。2012年1~5月份,全国房地产开发投资22213亿元,同比增长18.5%,增速比1~4月份回落0.2个百分点。其中,住宅投资15098亿元,增长13.6%,增速回落0.3个百分点。1—5月份,商品房销售面积
在押犯王某因盗窃罪已是三进宫。第二次刑满释放后,王某找到一份收入较高的工作,但由于不堪忍受某些人的歧视。王某辞职回家。回家后又得不到家人的谅解。于是王某为再次入狱而犯罪。如果你是管教人员。请问你如何做好王某的思想教育工作?
若有以下程序#include<stdio.h>intk=7;voidf(int**s){int*t=&k;*s=t;printf("%d,%d,%d,",k,*t,**s);}main(){inti=3,*p=&i,**r=&p;f(
每个查询都有3种视图,分别为:设计视图、数据表视图和【】。
最新回复
(
0
)