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
2024-01-22
30
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 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. [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
细节题。短文第三段第一句指出Analysis of the changes in magneticproperties and conductivity of rocks provides further data for prediction.即对岩石的磁性和导电性变化的分析为地震预测提供了很多数据。故选项B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3384859.html
相关试题推荐
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
ThewordYogaitselfcomesfromanancientSanskritwordmeaning"union".Wh
随机试题
[originaltext]W:Haveyoueverbeenchasedbyadog,Keith?M:No,Ihaven’t,i
[originaltext]M:So,Kathy,youarethemanageroftheCanfordStreetPark.Tel
WhenNicholasPavewasthreeyearsold,heateapieceofcakeataparty.W
Britain’sredphoneboxeshavebecomeoutofdateintheageofthemobile.
TheBeautyAdvantage[A]Mostofushaveheardthestory
TheMidwestisAmerica′smostimportant
糖粉与糊精是颗粒剂制备中常用的辅料,其与稠膏比例一般为() A稠膏:糖粉:糊
周老师在某地一所高级中学负责招生录取工作,在招生录取工作中,周老师发现学生张晓的
统计表明,某国的火车事故多发生在南部地区,因此在北部地区坐火车更安全。以下哪项最
2×16年至2×19年,甲公司发生的与A仓库相关的交易或事项如下: 资料一:2
最新回复
(
0
)