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
24
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.
The passage suggests which of the following about changes in the earth’s magnetic alignment?
选项
A、They are infrequent events, whose causes are yet to be conclusively established.
B、They occur infrequently but at regular intervals, more often through the diffusion process than "field regeneration".
C、They occur regularly, more often through the "field regeneration" process than through diffusion.
D、They occur frequently but irregularly, because "field regeneration" is more often the cause.
E、They occur irregularly, largely because they are dependent on the rare large changes in the flow of the earth’s core.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/yGjO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Itwasanearlymorninginsummer.Inthestreets,sleepyeyedpeopleweremovingquickly,headingtowardstheirjobs.Thiswas
That’sthereason______Anncouldnotdoherpartofthejob.
WhenImentiontheproblem,I’mnot______allofyou.
Thisyear’sawardsincludeanew______:forcompanieswithbrightideasonrecyclingwaste.
Jeandidnothavetimetogototheconcertlastnightbecauseshewasbusy______forherhistoryexamination.
Bytheendofthismonth,wesurely______asatisfactorysolutiontotheproblem.
IfyouAhadstudiedtheproblemcarefullyByesterday,youCwon’thaveanydifficultyDnow.
Thetrainstarts______6:20,soyou’dbettergettherebefore6.
Evans:Ijustreceivedaletterfromoneofmyoldhighschoolbuddies.Danae:【D5】______Evans:Well,actuallyIhaven’t
CRUCIAL:PERTINENT::
随机试题
A、月经前或月经来潮6小时内进行诊断性刮宫B、月经干净后3天进行诊断性刮宫C、在月经第3天进行诊断性刮宫D、在月经第5天进行诊断性刮宫E、月经周期任何日期内均可进行诊断性刮宫诊断无排卵型功血者
下列哪项是正常产褥期的表现
背景资料某枢纽工程施工招标文件依据《水利水电工程标准施工招标文件》(2009年版)编制,其中工程量清单采用工程量清单计价规范格式编制。管理房装饰装修工程以暂估价形式列入工程清单。投标人甲编制的该标段投标文件正本1份,副本3份。正本除封
在CFR条件下,如合同未规定卖方在货物装船后发装船通知,卖方就没有该义务。()
人民币渐进升值,对内外资投资于中国资本市场产生极大的吸引力。()
增长人的知识、经验,发展人的智慧、潜能,全面提高人的素质等在教育过程之中实现的价值是教育的()
甲、乙两个工厂生产同一种玩具,甲厂生产的玩具数量每月保持不变,乙厂生产的玩具数量每个月增加一倍,已知一月份甲、乙两个工厂生产玩具总数是98件,二月份甲、乙两个厂生产的玩具总数是106件。那么乙厂生产的玩具数量第一次超过甲厂生产的玩具数量是在几月份?(
Areyoufacingasituationthatlooksimpossibletofix? In1969,thepollutionwasterriblealongtheCuyahogaRivernearC
Readthearticlebelowabouteducationandanswerthequestions.Foreachquestion23—28,choosethecorrectanswer.M
【B1】【B8】
最新回复
(
0
)