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
77
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
Kissing,strokingandwildembracesarecommonenough,andnowthequiet,ro
《秦俑魂》的首演者是刘震。()
A.银翘散 B.止嗽散 C.败毒散 D.麻黄汤 E.小青龙汤治疗外感风寒
氢原子可以看成电子在平面内绕核做匀速圆周运动的带电系统。已知电子电荷为e.质量为
患者男,29岁。车祸致腹部开放性损伤,部分肠管脱出。紧急处理的方法是A.消毒碗覆
关于城市地下空间规划的表述,下列哪项是准确的?()A.随着地铁站、地下商业
(2018年5月)有关笔试的表述,不正确的是( )。A.可以对大规模的应聘者同
2020年田某取得全年一次性奖金80000元,选择单独计算缴纳个税,田某应
甲向乙购买一台设备,合同中未约定检验期,设备运回后甲经检验未发现问题,遂投入使用
在海拔1OOOm及以下空气清洁无明显污秽的地区,11OkV悬垂绝缘子串的片数为不
最新回复
(
0
)