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
26
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
Whichoftheitalicizedpartsfunctionsasanappositive?A、Askilfulhandatimp
Thenoiseoutsidetheclassroom______mefromlisteningattentivelytotheteac
[originaltext]Itlookslikeagreattimefore-mailbutalousytimefore-
A. B. C. D.
沈先生准备为其刚出生的女儿购买一份教育年金保险。根据保险合同的规定,孩子0岁到1
企业人力资源发展规划的结构设计包括()。A.信念是企业文化的内涵,属于精神范畴
施工企业购买材料设备后交付承运人运输,未按约定给付承运费用时,承运人有权扣留足以
2021年4月,税务机关对某房地产开发公司开发的房产项目进行土地增值税清算
从传播形式来看,小道消息有几种传播形式,最常见的传播形式是()。A.轮状传播
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)