首页
登录
职称英语
[originaltext] The origin of Earth’s moon, the largest moon in the solar sys
[originaltext] The origin of Earth’s moon, the largest moon in the solar sys
游客
2023-09-11
65
管理
问题
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 tree 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, member, 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 origin of the Earth
B、The origin of the Moon.
C、The Earth and the Moon.
D、The Moon and the Mars.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3005362.html
相关试题推荐
[originaltext]Easterisamixofthreetraditions:Pagan,HebrewandChr
[originaltext]W:Goodmorning.WhatcanIdoforyou?M:Goodmorning.I’vecome
[originaltext]W:Goodmorning.WhatcanIdoforyou?M:Goodmorning.I’vecome
[originaltext]W:Goodmorning.WhatcanIdoforyou?M:Goodmorning.I’vecome
[originaltext]M:Hey,Linda!Longtimenosee!Iheardthatyou’regoingonab
[originaltext]M:Hey,Linda!Longtimenosee!Iheardthatyou’regoingonab
[originaltext]W:Iboughtadressingtable.andmyroommateleftherstomeyest
[originaltext]W:Iboughtadressingtable.andmyroommateleftherstomeyest
[originaltext]W:Iboughtadressingtable.andmyroommateleftherstomeyest
[originaltext]W:Iboughtadressingtable.andmyroommateleftherstomeyest
随机试题
Thatexperiencesinfluencesubsequentbehaviorisevidenceofanobviousbu
Nowadaysadvertisingcostsarenolongerinreasonable______tothetotalcostof
WritingEffectiveSurveyQuestionsI.Forquantitativedat
[originaltext]Wouldyouliketohaveacupofcoffee?[/originaltext][originalt
A.立即因呼吸衰竭死亡 B.四肢屈伸功能丧失 C.上肢屈肘动作存在,伸肘及手
中医的肾子相当于A.阴茎 B.睾丸 C.附睾 D.精索 E.睾丸及附睾
在房地产经纪机构注销时,下列对尚未完成的房地产经纪业务所采取的处理方式中,不正确
现售商品房的房地产开发企业应当具有企业法人营业执照和()A:房地产开发管理条例
工程建设项目()是风险分析的基础,其目的是减少工程建设项目构成的不确定性。A.风
编码方案是对企业关键核算对象进行分类级次及各级编码长度的制定,其设置包括()的设
最新回复
(
0
)