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
2025-01-15
9
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] Which of the following CANNOT be concluded from the passage?
选项
A、The number of earthquakes is closely related to depth.
B、Roughly the same number of earthquakes occur each year.
C、Earthquakes are impossible at depths over 460 miles.
D、Earthquakes are most likely to occur near the surfaces.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3914039.html
相关试题推荐
Innovationcancomefromwithoutaswellaswithin.Appleiswidelyassumed
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
[originaltext]Earthquakesareviolent,destructive—andunpredictable!Theo
[originaltext]Earthquakesareviolent,destructive—andunpredictable!Theo
[originaltext]Earthquakesareviolent,destructive—andunpredictable!Theo
[originaltext]Earthquakesareviolent,destructive—andunpredictable!Theo
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
随机试题
[originaltext]M:Oh,hi,thisbookisduetoday,andIamnotquitefinishedwi
Imaginingbeingaskedtospendtwelveorsoyearsofyourlifeinasociety
某桥梁工程项目,业主和承包人签订施工合同后,承包人在合同规定的时间内提供给监理工
建议行超声引导下穿刺活检明确诊断的是()。A.甲状腺多发结节伴甲亢 B.甲状
我国行政组织的层级制度最常见的是()。A.省长、市长、县长 B.部、局、处或
钢以外其他基材的热塑性粉末涂料单涂涂层厚度为()。A.0.28~0.70mm
患者,男性,35岁,发作性咳嗽、咳痰、喘息8年,加重1天。吸烟10年,每日10支
属于萜类的抗疟药为A.薄荷醇 B.龙脑 C.青蒿素 D.樟脑 E.奎宁
( )特指公司赠予经理人员的一种权利,持有这种权利的经理人可以在规定时间内以行
将二进制数11001转换成相应的十进制数。其正确结果是: A.25B.3
最新回复
(
0
)