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
2013-11-18
51
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.
Crustal rocks can be used to predict earthquakes for their______.
选项
A、conductivity of electricity
B、hardness to be cracked
C、sensitivity to strain
D、magnetic properties
答案
C
解析
细节辨认题。该句说,外壳岩的电磁特性对压力非常敏感。由此推知,这就是它可以用来测量板块压力的原因,所以它可以帮助预测地震。故C)“对压力的敏感性”为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/gHS7777K
0
大学英语四级
相关试题推荐
Thestoryofthe【S1】______Titaniccontinuesto【S2】______peopletodaypartlybecauseofthe1998Hollywoodmovies,Titanic.Peopl
Peoplewholivedintownsandcitiescouldeasilyrefreshthemselvesinthehotsummersjustbeforetheturnofthe【B1】______.C
AfterthreeyearsatNewYorkUniversity,Ileftatthetimetotakeasix-monthbreakandcomebackthenextsemester.Ineeded
AfterthreeyearsatNewYorkUniversity,Ileftatthetimetotakeasix-monthbreakandcomebackthenextsemester.Ineeded
Wealwaysconvinceourselvesthatlifewillbebetterafterwegetmarried,haveababy,thananother.Thenwearefrustratedth
Theideaoftelevision,transmittingpicturesthroughtheairoroverwires,hasbeenaroundsincethelate19th【B1】______.
ThemostimportantlawcourtinAmericaiscalledthe______court.
A、Themanwasconfusedaboutthedateoftheappointment.B、Themanwantstochangethedateoftheappointment.C、Themanisgl
A、Personaldevelopment.B、Simpledailyproblems.C、Nationalcrises.D、Politicalissues.B文章最后明确指出“MostAmericanheroesarethos
Foryearstherehavebeenendless.articlesstatingthatscientistsareonthevergeofachievingartificialintelligence,that
随机试题
在乡村常用明矾溶于水,其目的是()。
常规胸部摄影时,正确的呼吸方式是
脑猪囊尾蚴病的临床表现复杂多样.但最常见的临床类型是
A.乙基纤维素B.甲基纤维素C.微晶纤维素D.羟丙基纤维素E.微粉硅
不得委托生产的药品有
孙先生,41岁,有吸烟史20年。全麻下行腹腔镜胆囊切除术后已拔除气管插管,病人意识模糊。目前最重要的护理是
《钢制压力容器》适用于设计压力不大于()的钢制压力容器的设计、制造、检验与验收。
依据《国家赔偿法》的规定,对于造成公民死亡或者全部丧失劳动能力的人,对其抚养的无劳动能力的人的生活费发放标准,参照民政部有关生产救济的规定办理。( )
Therearemanydifferenttypesofaccesscontrolmechanismsthatarecommonlyembeddedintoalloperatingsystems.Whichofthe
Justasworldoilscarcityisalreadycausinginternationalconflicts,sowillthescarcityofwaterreachapointwherewarswi
最新回复
(
0
)