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
2023-11-06
76
管理
问题
What is the important discovery about seismic waves mentioned by the instructor? [br]
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、When the Earth was formed.
B、The composition of the Earth’s interior.
C、Why lava is hot.
D、How often a volcano is likely to erupt.
答案
B
解析
语义理解题。从“This finding enabled geologists to study the inner parts of the earth.”可知推断出由于地震产生地震波,而地震波可以在地球内部传播数千英里,这使得地质学家们可以研究地球内部的构成情况。选项B为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/3162959.html
相关试题推荐
Iknowitisn’timportantbutIcan’thelp______aboutit.A、buttothinkB、thin
WhichofthefollowingisNOTmentionedasadifferencebetweentheone-bedroom
WhichofthefollowingisNOTmentionedasadifferencebetweentheone-bedroom
WhichofthefollowingisNOTmentionedasadifferencebetweentheone-bedroom
Whatisthemostimportantfunctionoftrees?[br][originaltext]Treesare
Whatisthemostimportantfunctionoftrees?[originaltext]Treesareuseful
Thisbookisabouthowthesebasicbeliefsandvaluesaffectimportant______of
Whatistheimportantdiscoveryaboutseismicwavesmentionedbytheinstructor?
Whatistheimportantdiscoveryaboutseismicwavesmentionedbytheinstructor?
WhichofthefollowingisNOTmentionedinthenewsitem?[originaltext]The
随机试题
Theadvertisingexecutiveswerein______overcontinuingtheirlatestsuccessful,
Lastnighthewas______byatricycleandhadtobetakentohospital.A、fallen
一般位于海滨、山城景色区或温泉附近的饭店是( )。A.长住型饭店 B.度假型
(2016年真题)下列投资风险中,属于系统性风险的是()。A.财务风险
按照《商业银行法》的规定,除国家另有规定外,商业银行等银行业金融机构在中国境内不
某车间有甲、乙、丙3个工人,现在3人合作生产零件。已知,3个工人加工3个零件需要
(2016年真题)期货交易所的合并、分立,由()批准。A.中国证监会 B
提示血容量不足的是A.中心静脉压很高,尿量少B.中心静脉压稍高,尿量多C.中心静
监理大纲评审时应重点评审监理大纲的()A、全面性 B、程序性 C、针对性
某居民企业本年度取得各项收入总额为1个亿,其中成本4000万元,财政拨款2000
最新回复
(
0
)