首页
登录
职称英语
What is the talk mainly about? [br] [originaltext] The origin of Earth’s mo
What is the talk mainly about? [br] [originaltext] The origin of Earth’s mo
游客
2023-11-20
42
管理
问题
What is the talk mainly about? [br]
The origin of Earth’s moon, the largest moon in the solar system, is still something of a mystery. There are some theories about its origin however. Now, keep in mind that a theory of the moon’s origin has to be consistent with two important facts. The first fact is that the Earth contains a lot of iron, most of it has an iron core. But the moon contains practically no iron. The second fact is that other than the difference in iron content, the moon and Earth are composed of accentually the same minerals, a similarity not shared with any other planet or moon in our solar system.
One of the earliest theories of the moon’s origin, I called it the Capture Theory, proposes that the moon was somehow captured by Earth’s gravitational force. This theory is improbable, however, because it assumes that the moon and Earth formed in different parts of the solar system. If this was true you would expect the moon’s composition to be much different from Earth’s composition, just as all the other planets in the solar system are so different from Earth.
A second theory of the moon’s origin is more promising. It is sometimes referred to as the Mars Theory, because according to this theory, when Earth was still molten, it was struck by a planet about the size of Mars. The impact caused the cores of the two planets to melt together and chunks of Earth’s crust to be thrown out into space. These chunks came together to form the moon. Now, remember, Earth’s crust is low in iron, because the iron is in Earth’s core, but high in various other minerals. This then accounts for why there is little iron but lots of other minerals on the moon.
选项
A、The Moon has no water.
B、The Moon contains almost no iron.
C、Thy Moon is the largest moon in the solar system.
D、Tile Moon does not have a moten core.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3202710.html
相关试题推荐
WhatdidAppleComputerInc.introduceonTuesday?[br][originaltext]Apple
WhofoundtheRoyalAcademyofArts?[br][originaltext]TheRoyalAcademy
WhofoundtheRoyalAcademyofArts?[br][originaltext]TheRoyalAcademy
WhatdoesBlueMagazinemostprobablyreferto?[br][originaltext]M:Iwastol
WhatdoesBlueMagazinemostprobablyreferto?[br][originaltext]M:Iwastol
WhatdoesBlueMagazinemostprobablyreferto?[br][originaltext]M:Iwastol
Whatkindofhaircutdidthemanwant?[originaltext]W:Hi.Howcanwehelpyou
Theconcernswiththeoriginsoftheearth______theirstudy.A、motivatedB、advi
WhatwasPaulaRadcliff’sperformancelikeinAthens?[br][originaltext](27
WhatwasPaulaRadcliff’sperformancelikeinAthens?[br][originaltext](27
随机试题
A--animationB--mouseC--bug
Thefirstattemptofmostartists,musicians,andwritersisseldomamaster
[originaltext]W:Hi,Kaven.YourroommatetoldmeIcouldfindyouintheTVlo
近年来,一些公共部门在提供公共服务过程中,要求公共服务对象出具各种“奇葩”证明的
关于药物的第Ⅰ相生物转化酯和酰胺类药物()A.氧化 B.还原 C.水解
全口义齿排牙时,下颌曲线的延长线应()A.与磨牙后垫1/2处一致
横切为两半,晒干或低温干燥的药材是A.蛇床子B.栀子C.山茱萸D.木瓜E.枳壳
肩关节周围炎可表现为 A.方肩B.肩章状肩C.耸肩D.冻结肩
(2020年真题)青光眼、前列腺重度肥大患者应避免使用的饮片是( )A.华山参
甲乙合伙购买1辆卡车从事运输。双方约定,按2:1的比例分成。某日,乙在为客户丙运
最新回复
(
0
)