首页
登录
职称英语
What is the important discovery about seismic waves mentioned by the instructor?
What is the important discovery about seismic waves mentioned by the instructor?
游客
2024-09-28
10
管理
问题
What is the important discovery about seismic waves mentioned by the instructor?
There were several important discoveries in the early part of last century that helped geologists develop a more accurate picture of the earth’s interior. The first key discovery had to do with seismic waves. Remember they are the vibrations caused by earthquakes. Well, scientists found that they travel thousands of miles through the earth’s interior. This finding enabled geologists to study the inner parts of the earth. You see, the studies revealed that these vibrations were of two types: compression, or P waves, and shear, or S waves. And researchers found that P waves travel through both liquids and solids, while S waves travel only through solid matter. In 1906, a British geologist discovered that P waves slowed down at a certain depth but kept traveling deeper. On the other hand, S waves either disappeared or were reflected back. So he concluded that the depth marked the boundary between a solid mantle and a liquid core. Three years later, another boundary was discovered that was between the mantle and the earth’s crust. There is still a lot to be learned about the earth. For instance, geologists know that the core is hot. Evidence of this is the molten lava that flows out of volcanoes. But we are still not sure what the source of the heat is.
选项
A、They occur at regular intervals.
B、They can withstand great heat.
C、They travel through the Earth’s interior.
D、They can record the Earth’s internal temperature.
答案
C
解析
语义理解题。短文说明:“The first key discovery had to do with seismic waves... scientists found that they travel thousands of miles through the earth’s interior.”即最关键的一个发现就是地震波。科学家们发现地震波在地球内部可以传播数千英里。所以,选项C为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3777522.html
相关试题推荐
Whatistheimportantdiscoveryaboutseismicwavesmentionedbytheinstructor?
WhichofthefollowingisNOTmentionedinthenewsitem?[originaltext]The
Gettysburgwasthe______ofthemostimportantbattleinAmericanCivilWar.A、sce
Itisimportantthatthehotelreceptionist______thatguestsareregisteredco
Parentsaretaughttounderstand______importanteducationistotheirchildren’s
WhichofthefollowingisNOTmentionedinthenews?[originaltext]Officials
Whatisthemostimportantfunctionoftrees?[originaltext]Treesareuseful
WhatdoesLaurasayismostimportantaboutabike?A、Itmustbetherightheight
TheauthorimpliesthatthisworldplanistoA、bedebatedatanimportantintern
What’sthemostimportantlessonEthbellislearning?A、SheislearningEnglisha
随机试题
Howlongdoestheluckypromotionlast?FromNovember1to____________,2006.
[audioFiles]audio_eusm_j61_001(20082)[/audioFiles]A、Shewillgotoworkbybike
下面哪种作用是短反馈调节A.TSH→T、T B.TSH→TRH C.TRH→
高温劳动时大量饮用不含盐分的纯水,患者可能发生A.日射病 B.热痉挛 C.中
一般情况下,运用假设开发法时,评估结果最大的估价前提是( )。A、业主自行开发前
测验的质量指标主要有()。 A.信度B.效度 C.难度D.区分度 E
一患者进行金属烤瓷冠修复,冠就位后发现冠十分密合,经调无早接触后选择聚羧酸粘固剂
资料1:F企业过去5年的有关资料如下: 资料2:F企业2
以下关于项目社会评价指标的表述,正确的有() A.定量指标多,定性指标少B
(2021年真题)某工程双代号网络计划如下图所示,图中出现的错误有( )。
最新回复
(
0
)