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
What Causes Earthquakes? People have tried to explain the cause of earthquakes since earliest times. Some people thought tha
What Causes Earthquakes? People have tried to explain the cause of earthquakes since earliest times. Some people thought tha
admin
2011-03-05
52
问题
What Causes Earthquakes?
People have tried to explain the cause of earthquakes since earliest times. Some people thought that quakes were sent from heaven to punish the wicked. Others believed that the earth rested on the backs of animals. We now have more scientific explanations of the cause of these destructive earth tremors. Earthquakes are evidence that some process is at work below the surface of the earth. Large bodies of magma may be in motion. These and other internal movements can result in a sudden release of energy by breaking the overlying, brittle rocks. During earthquakes, rocks beneath the surface are clearly bent and broken. In other cases deformation takes place slowly and without recognizable earthquake shocks. For example, in a drill hole in the Great Valley of California, earth movements have been measured for years. The rocks here are moving at a rote of about one meter per century. In some places pressure slowly builds up until the rocks break and quickly snap back into position. The faulting releases energy that may have built up in the rocks for hundreds or thousands of years. This sudden burst of energy causes vibrations that travel through the rocks. These vibrations are an earthquake. Most earthquakes are so small that they can be detected only by sensitive instruments along the fault surface. However, energy may continue to trickle off in aftershocks. These shocks are much less severe than the main shock and may continue for months after the initial earthquake.
Summary:
Scientifically speaking, earthquakes are caused when【71】movements of the earth suddenly release energy by breaking the overlying rocks on the surface. During earthquake, rocks are clearly bent and broken. Elsewhere, rocks may slowly【72】over many years. Then the pressure may increase until the rocks break and snap back. This break【73】the energy in the rocks and causes vibrations. Most earthquakes are so small that they can be barely【74】, but large violent earthquakes can destroy inhabited areas. Sometimes【75】many follow after the first movement.
选项
答案
detected
解析
转载请注明原文地址:https://kaotiyun.com/show/e2yK777K
本试题收录于:
A类竞赛(研究生)题库大学生英语竞赛(NECCS)分类
0
A类竞赛(研究生)
大学生英语竞赛(NECCS)
相关试题推荐
Brazilianscertainlyknowhowtothrowaparty—butwillRiobereadytowelcomeover10,000athletesandalltheinternationalv
ThemostcommonlegendaboutthediscoveryofcoffeeisthatithappenedintheninthcenturyA.D.AgoatherderinEthiopiana
OnedayIcanhearthefaintrustleofautumncoming.ThenextdayIcan’t.Oneeveningsummerleaksawayintothecoolnightsk
Supposingthatinternationalagreementcouldbeobtainedtomitigatethesedifficulties,whatistheproperpolicyto__________?
We,thepeople,stillbelievethatenduringsecurityandlastingpeacedonotrequireperpetualwar.Ourbravemenandwomenin
Thedimensionsoftourismareastonishing.In2012,theU.N.tourismorganizationcelebratedreaching1billioninternationaltrip
______waschosenmadeatremendousstirinthetown.
Nora:You’relate.Nowwe’llmissthemovie.Alex:______Iwasstuckintraffic.
John:Theradio’sterriblyloud.Couldyouturnitdownalittle?Peter:Sorry!______.John:Yes,andsomethingelse—wouldn’t
John:Theradio’sterriblyloud.Couldyouturnitdownalittle?Peter:Sorry!______John:Yes,andsomethingelse-wouldn’ti
随机试题
税务代理应遵循的基本原则。
帕金森病可用肝豆状核变性可用
一类风湿关节炎患者,病程持续1年余,有对称性多关节肿痛,未经治疗,三大常规及肝肾功能检查正常,首选方案是.
泰昌有限公司共有6个股东,公司成立两年后,决定增加注册资本500万元。下列哪一表述是正确的?(2013年试卷三第26题)
下列关于借贷记账法的说法中,正确的有()。
E公司拟投资建设一条生产线,行业基准贴现率为10%,现有六个方案可供选择,相关的现金净流量数据如下表所示:要求:(I)根据表中数据,分别确定下列数据:①A方案和B方案的投资期;②c方案和D方案的营业期。(
对于承租人来说,租金可以在税前扣除,减少税基从而减少应纳税额。()
4,2,,()
《中华人民共和国民法总则》于2017年3月15日通过,2017年10月1日生效。此次修改,将限制民事行为能力人的年龄界定为()周岁以上的未成年人。
以下关于计算机网络特征的描述中,哪—个是错误的______。
最新回复
(
0
)