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
Periodic realignment of the Earth’s magnetic field occurs two ways: the first, "field regeneration", or the creation of n
Periodic realignment of the Earth’s magnetic field occurs two ways: the first, "field regeneration", or the creation of n
admin
2011-01-17
20
问题
Periodic realignment of the Earth’s magnetic field occurs two ways: the
first, "field regeneration", or the creation of new magnetic fields from the
ambient geomagnetic field, takes place because magnetic field lines are trapped
Line in effective electrical conductors. The field is trapped in molten iron which
(5) moves in response to the forces imposed upon it and as the core moves, the field
lines are stretched and twisted, creating a new magnetic field. The second
process is the diffusion of the magnetic fields: in the same way that a drop of
dye will soon diffuse throughout a swimming pool, a concentration of magnetic
field lines diffuses throughout the planet’s outer core. On the large scale of
(10) stars and planets, the field lines are caught up in the fluid motion and distorted,
generating a new magnetic field before diffusing away. This rarer type of field
reversal is likely caused by unexplained larger changes in the flow in the outer
core, though scientists have suggested such fluctuations may simply be extreme
examples of fluctuations in the dynamo processes-an El Nino in the weather of
(15) the outer core.
Which of the hypothetical discoveries would MOST likely shed doubt on the author’s claim that "field regeneration" could be responsible for the earth’s magnetic reversals?
选项
A、Extreme fluctuations in the dynamo processes are discovered to be exceedingly rare, if they occur at all.
B、Magnetic field lines are discovered to diffuse very poorly through the earth’s outer core.
C、Realignment of the earth’s magnetic polarity is discovered to occur much more frequently than was previously believed.
D、Molten iron is discovered to be a poorer electrical conductor than was previously believed.
E、The earth’s core is found to move at a much faster rate than had previously been measured.
答案
D
解析
转载请注明原文地址:https://jikaoti.com/ti/hyWYFFFM
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Perhapsmorethananythingelse,scientistsareeagertofindoutifMartianlifeexistedinthepast—orstillexists.【C1】______
Atthebeginningofthisterm,ourhistoryprofessor______alistofbooksforustoread.
TheRepublicPartyhadonlywona______victorybyelevenvotesintheelection.
Children______bytheirparentsareallowedtoenterthestadium.
Mikeinsists___________hisownopinionbecorrect.
F:Weoughtnottotestthesafetyofnewdrugsonsentientanimals,suchasdogsandrabbits.Ourbenefitmeanstheirpain,and
Therecreationdirectoratalocalyouthclubsurveyedthememberstodetermineinterestintwoactivities—ahikingtripandas
PAINTER:CARICATURIST::
Whenfamouspeoplesuchasactors,athletesandrockstarsgivetheiropinions,manypeoplesimplylisten.Doyouthinkwes
随机试题
人在患病后,有权选择愿意接受或拒绝医生制定的诊治方案,这种权利是
溶血作用较显著的是溶血作用较弱或无溶血作用的是
A、阿奇霉素B、米诺环素C、环丙沙星D、多粘菌素E、头孢拉定可导致跟腱炎的是
下列关于因果关系的说法正确的有:
城镇道路雨期施工时,要防排结合,建立完善的()。
国际海运中,大副编制积载计划的主要依据是( )。
中国政府于2013年11月23日发表声明,宣布划设()防空识别区,并发布航空器识别规则公告和识别区示意图。
Ajoblessmanwantedverymuchtohavethepositionof“officeboy”atMicrosoft.TheHRmanagerinterviewedhimandthenwatchedh
材料1顾名思义,人肉搜索就是利用现代信息科技(电视、电脑、广播、新闻报刊等),变传统的网络信息搜索为人找人、人问人、人碰人、人挤人、人挨人的关系型网络社区活动,变枯燥乏味的查询过程为一人提问、八方回应,一石激起千层浪,一声呼唤惊醒万颗真心,千方百计的搜索
Broadlyspeaking,theEnglishmanisaquiet,shy,reservedpersonwhoisfully【21】______onlyamongpeopleheknowswell.In
最新回复
(
0
)