首页
登录
职称英语
Most earthquakes occur within the upper 15 miles of the earth’s surface. But
Most earthquakes occur within the upper 15 miles of the earth’s surface. But
游客
2023-12-23
60
管理
问题
Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur at all depths to about 460 miles. Their number decreases as the depth increases. At about 460 miles one earthquake occurs only every few years. Near the surface earthquakes may run as high as 100 in a month, but the yearly average does not vary much. In comparison with the total number of earthquakes each year, the number of disastrous earthquakes is very small.
The extent of the disaster in an earthquake depends on many factors. If you carefully build a toy house with an erect set, it will still stand no matter how much you shake the table. But if you build a toy house with a pack of cards, a slight shake of the table will make it fall. An earthquake in Agadir, Morocco, was not strong enough to be recorded on distant instruments, but it completely destroyed the city. Many stronger earthquakes have done comparatively little damage. If a building is well constructed and built on solid ground, it will resist an earthquake. Most deaths in earthquakes have been due to faulty building construction or poor building sites. A third and very serious factor is panic. When people rush out into narrow streets, more deaths will result.
The United Nations has played an important part in reducing the damage done by earthquakes. It has sent a team of experts to all countries known to be affected by earthquakes. Working with local geologists and engineers, the experts have studied the nature of the ground and the type of most practical building code for the local area. If followed, these suggestions will make disastrous earthquakes almost a thing of the past.
There is one type of earthquake disaster that little can be done about. This is the disaster caused by seismic sea waves, or tsunamis. (These are often called tidal waves, but the name is incorrect. They have nothing to do with tides. ) In certain areas, earthquakes take place beneath the sea. These submarine earthquakes sometimes give rise to seismic sea waves. The waves are not noticeable out at sea because of their long wave length. But when they roll into harbors, they pile up into walls of water 6 to 60 feet high. The Japanese call them "tsunamis", meaning "harbor waves", because they reach a sizable height only in harbors.
Tsunamis travel fairly slowly, at speeds up to 500 miles an hour. An adequate warning system is in use to warn all shores likely to be reached by the waves. But this only enables people to leave the threatened shores for higher ground. There is no way to stop the oncoming wave. [br] The United Nations’ experts are supposed to
选项
A、construct strong buildings
B、put forward proposals
C、detect disastrous earthquakes
D、monitor earthquakes
答案
B
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3299481.html
相关试题推荐
Innovationcancomefromwithoutaswellaswithin.Appleiswidelyassumed
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
[originaltext]Earthquakesareviolent,destructive—andunpredictable!Theo
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
随机试题
Don’tbetoohardonthekid.______,heisonlyaboyoftwelve.A、AboveallB、Of
Theymayappeartobemarvelsofmodernscience.Buttheideasthatledtot
IfoursolarsystemhasaHell,it’sVenus.Theairischokedwithfouland
在正常使用条件下,屋面防水工程、有防水要求的卫生间、房间和外墙面的防渗漏工程的最
冠心病患者不必限制的膳食是A.刺激性食物 B.含单糖和双糖高的食物 C.高胆
建设工程合同签订以后,发包人往往会支付给承包人一定比例的预付款,一般不低于合同金
艾滋病抗病毒治疗()ART)中以下哪一组合不作为艾滋病抗病毒治疗方案?()A、3
根据下面资料,回答 Asweknow,museumsarebuild
外感咳嗽治以疏散外邪、宣通肺气为主,一般不宜过早使用下列何药 A.苦寒药 B
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)