首页
登录
职称英语
[originaltext]Moderator: Good morning, class. Today Professor Liu will give us
[originaltext]Moderator: Good morning, class. Today Professor Liu will give us
游客
2023-08-13
32
管理
问题
Moderator: Good morning, class. Today Professor Liu will give us a lecture about earthquakes. Welcome.
Professor Liu: Thank you. As you know, some earthquakes are not powerful enough to be felt on the earth’s surface while in others, people can, indeed, feel the earth shaking. And of course, there might be violent movement, often with catastrophic results. What we feel during an earthquake or huge explosion are a series of waves called seismic waves.
In an earthquake, you might initially feel some minor trembling, then perhaps violent shaking, and then some more tremors. [16] The reason why you feel these different types of movement is because there are different kinds of seismic waves. There are two major types of seismic waves: body waves and surface waves.
The waves that you feel first are body waves. These mainly travel deep through the earth’s interior rather than at the surface. Some of them travel very fast, and that’s why you feel them first. [17] But because they travel deep inside the earth, they’re felt only as tremors. There are two types of body waves. The first type of body wave is the P wave or primary wave. It’s the fastest kind of seismic wave. These waves can move through any type of material, including rock and fluids. Because of this and because of their speed, these waves are the first to reach the earth’s surface. You likely won’t even hear or feel these waves, but animals may hear them. They’re not strong enough to cause significant damage. The other type of body wave is the S wave or secondary wave. Because S waves travel at half the speed of P waves, you won’t feel them in the beginning.
[18-1] Unlike body waves, surface waves move at or near the earth’s surface. These waves are similar to ripples on water. [18-2] They are usually the most destructive type of seismic wave because of their lower frequency, larger amplitude, and longer duration. There are two types of surface waves. The first kind of surface wave is called a love wave. It’s the fastest surface wave. The other kind of surface wave is the Rayleigh wave. It rolls along the ground just like a wave rolls across a lake or an ocean. As a result, it moves the ground up and down and side to side in the same direction that the wave is moving. [19] Most of the shaking felt from an earthquake is due to the Rayleigh wave, which can be much larger than the other waves. They are slower than body waves, and sometimes cars might appear to be moving up and down with these waves.
Questions 16 to 19 are based on the recording you have just heard.
16.Why do we feel different types of movement in an earthquake?
17.Why do we feel body waves only as tremors?
18.What are the most destructive type of seismic wave?
19.Which seismic wave brings us shaking felt from an earthquake?
选项
A、There are different kinds of sound waves.
B、Different people have different abilities of sense.
C、There are different kinds of seismic waves.
D、The travelling speed of waves differs greatly.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2923661.html
相关试题推荐
[originaltext]Haveyoueverfoundyourselfinthissituation:Youhearaso
[originaltext]Haveyoueverfoundyourselfinthissituation:Youhearaso
[originaltext]Moderator:Hello,ladiesandgentlemen,itgivesmeagreath
[originaltext]Moderator:Hello,ladiesandgentlemen,itgivesmeagreath
[originaltext]Moderator:Hello,ladiesandgentlemen,itgivesmeagreath
[originaltext](12)AnewprogramcalledAdelanTECHLeadershipishelpings
[originaltext]Imaginehackersstealingtopsecretfilesfromamilitarybas
[originaltext]Imaginehackersstealingtopsecretfilesfromamilitarybas
[originaltext]M:Shakinganinfantoutofangerorfrustrationcanleadtoseve
[originaltext]M:Shakinganinfantoutofangerorfrustrationcanleadtoseve
随机试题
GlobalDevelopmentsSociologiststellusthereisali
Forthispart,youareallowed30minutestowriteashortessayononlinepa
Anindustrialsociety,especiallyoneascentralisedandconcentratedastha
中小微创业企业早期融资需求的特征是( )。A.较大规模、较大比例的股权投资
(2015年5月)绩效管理指标的贯彻执行必须保证绩效管理的科学性、合理性和公平性
心力衰竭治疗中唯一能够控制体液潴留的药物是A.利尿药 B.阿托品 C.β受体
下列关于涉税鉴证业务鉴证准备的表述,错误的是( )。A.鉴证人承接涉税鉴证业务,
(2020年真题)甲公司为增值税一般纳税人,主要从事高档化妆品的生产和销售业务。
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
锅炉热态调试与试运转之前应完成的工作不包括( )。 A.锅炉设备及锅炉辅助机
最新回复
(
0
)