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
60
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
ThemayorofCountyClubHillshelpedarresttwomenWednesdaynightsuspect
投资者可以根据证券价值与当前证券市场价格的比较决定是否进行证券投资。()
质量管理常见的方法有:PDCA循环、()等。A.零缺陷、质量三部曲和CMM
A.5级 B.1级 C.3级 D.4级 E.2级中药保护期限为10年的品
下列有关脊柱的描述哪项错误A.仰卧位时L2最高 B.由椎骨以及椎间盘、椎间关节
旋覆代赭汤的功用是A.行气疏肝,散寒止痛 B.行气消痞,降逆止呕 C.降逆化
血液保存液ACD的抗凝作用原理主要是试剂能结合A.纤维蛋白原B.MgC.补体D.
国家对药品价格实行( )。A.政府定价 B.政府指导价 C.政府定价、政府
在客户法人治理结构评价中,对客户内部激励约束机制评价需考虑的关键因素有()
年金终值和现值的计算通常采用()的形式。A:折现B:单利C:复利D:贴现
最新回复
(
0
)