首页
登录
职称英语
Periodic realignment of the Earth’s magnetic field occurs two ways: t
Periodic realignment of the Earth’s magnetic field occurs two ways: t
游客
2024-01-11
19
管理
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. [br] 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://tihaiku.com/zcyy/3353311.html
相关试题推荐
TheprobabilitythateventAoccursis0.6andtheprobabilitythateventBoccu
Acarmanufacturerperiodicallydiscountscertaincarmodelstoitsdealerstoc
ElNino,theperiodicabnormalwarmingoftheseasurfaceoffPeru,aphenomenon
TheprobabilitythateventAoccursis0.6andtheprobabilitythateventBoccu
FERROUS:A、magneticB、rustyC、withnoironD、hydratedE、non-reactiveC
PeriodicrealignmentoftheEarth’smagneticfieldoccurstwoways:t
PeriodicrealignmentoftheEarth’smagneticfieldoccurstwoways:t
PeriodicrealignmentoftheEarth’smagneticfieldoccurstwoways:t
FERROUS:A、magneticB、rustyC、withnoironD、hydratedE、non-reactiveC
Sleepactuallyoccurs(i)______thoughonemayreceivecluessignalingits(ii)__
随机试题
GreenhouseEffectI.【T1】_____ofthegreenhou
Marriagemayimproveyoursleep,andbettersleepmayimproveyourmarriage,
[originaltext]HettyGreenwasaveryspoilt,onlychild.ShewasborninMa
A
异烟肼中的特殊杂质是A.阿司匹林B.苯巴比妥C.游离肼D.庆大霉素E.阿托品
根据下列资料回答问题。 《河北省2010年国民经济和社会发展统计公报》显示:河
下列行为或意图中,()不会产生考评的苛严误差。A:考评标准过低 B:惩罚一些不
下列关于股指期货合约的理论价格的说法,正确的是()。A.根据期货理论,期货价格
采用尿排泄数据求算动力学参数须符合以下条件A.有较多代谢药物从尿中排泄 B.药
根据民事法律制度的规定,下列行为中,属于滥用代理权的有( )。A.代理人甲以被
最新回复
(
0
)