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 is the important discovery about seismic waves mentioned by the instructor?
What is the important discovery about seismic waves mentioned by the instructor?
admin
2014-09-18
38
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://kaotiyun.com/show/oqTK777K
0
专业英语四级
相关试题推荐
JazzisAmerica’scontributiontopopularmusic.(1)______classicalmusic,whichfollowsformalEuropeantraditions,jazzis(2)_
Nowcustomhasnotbeencommonlyregardedasasubjectofanygreatimportance.Theinnerworkingsofourownbrainswefeelto
Thelocaltheaterhasitsspecialwaysofdrawingcrowds.UnliketheBroadwayperformancesthat(1)______totheelitestratum,d
Cultureinfluencesanindividual’shealthbeliefs,behaviours,activitiesandmedicaltreatmentoutcomes.(1)______thesignifica
SputnikIwasthefirstartificialsatellite.Itcanbedescribedasanaluminum(1)______withadiameterof58centimetersand
Whatistheconversationabout?
Whatistheconversationmainlyabout?
Manydogownersregardtheirfurryfriendsastheirchildren,andtalktothem【C1】______Now,anewstudyreportsthatdogs,
Theunrighteousofficerpreferstoresign______partinsuchdishonestbusinessdeals.
AsforAnn,Iamnotsureabouther______inItalian.
随机试题
健脾丸的用法为
单纯型慢支和喘息型慢支主要区别在于
对于800kVA干式变压器带有IP2X及以上防护等级金属外壳与门净距不应小于()
根据《水工混凝土施工规范》(DL/T5144-2001),同一强度等级混凝土抗拉强度试验,混凝土设计龄期应每()成型一组。
某大型水利水电工程施工过程中,承包人未通知监理机构及有关方面人员到现场验收,即将隐蔽部位覆盖,事后监理机构指示承包人采用钻孔探测进行检验,发现检查结果合格,由此增加的费用应由()承担。
甲公司系增值税一般纳税人,2014年至2017年与固定资产业务相关的资料如下:资料一:2014年12月5日,甲公司以银行存款购入一套不需安装的大型生产设备,取得的增值税专用发票上注明的价款为5000万元,增值税税额为850万元。资料二:2014年12月
ABC会计师事务所负责审计甲公司2011年度财务报表,并委派A注册会计师担任审计项目合伙人。A注册会计师在审计甲公司会计估计的过程中遇到下列事项,请代为做出正确的专业判断。在甲公司作出的下列会计估计中,A注册会计师应当确定为不确定性相对较低的是(
某公司在2011年8月完成某发明后,于12月在国内一杂志上公开发表其技术方案。2012年4月1日,该公司准备就该发明申请专利。依据《专利法》的规定,该发明创造()。
设函数f为[0,1]上的连续函数,且0≤f(x)<1,利用二重积分证明不等式:
下列程序的输出结果是()。#include<stdio.h>main(){inta=4;printf("%d\n",(a+=a-=a*a));
最新回复
(
0
)