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
2024-02-20
33
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
细节辨认题。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/3467902.html
相关试题推荐
EarthquakesWhatcausesearthquakes?Theearth
EarthquakesWhatcausesearthquakes?Theearth
EarthquakesWhatcausesearthquakes?Theearth
EarthquakesWhatcausesearthquakes?Theearth
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
DidtheAncientGreeksandRomanshaveasenseoffashion?Historiansofdre
DidtheAncientGreeksandRomanshaveasenseoffashion?Historiansofdre
Therearemany【B1】______aboutthebeginningofdramainancientGreece.The
Therearemany【B1】______aboutthebeginningofdramainancientGreece.The
Therearemany【B1】______aboutthebeginningofdramainancientGreece.The
随机试题
绿色施工管理是建筑施工企业现代安全生产管理的先进理念。项目管理人员应努力学习绿色
下列墨水可以用于书写工程文件的是()。A.纯蓝墨水 B.红色墨水 C.圆珠
蒸压加气混凝土砌块砌体和轻骨料混凝土小型空心砌块砌体可与其他块材混砌。()
下列阴茎癌的临床特点,正确的是A.手术治疗时,阴茎断端应距肿瘤近端缘2cm以上
代谢性酸中毒常见的临床表现有A.呼吸浅慢 B心肌收缩力减弱 C中枢神经
护士在护理少尿与无尿患者时,最佳的护理措施是A.口腔护理 B.预防感染 C.
从收入方面看,政府通过预算的安排,采用()等手段参与国民生产总值的分配,把各地
认知同化理论的核心就是( )A.学生能否习得新信息,主要取决于它们认知结构中已
可燃物质的聚集状态不同,其受热后所发生的燃烧过程也不同。下面关于物质燃烧的说法中
最新回复
(
0
)