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
24
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
Howmanypeoplehavebeenestimatedtobedeadintheconflict?[br][originalt
TheBusinessofMediaViolenceIn2001,pe
当无设计要求时,基础墙的防潮层应采用()。A.1:2水泥砂浆加适量防水剂铺设.
将数组{1,1,2,4,7,5}从小到大排序,若采用()排序算法,则元素之间需
对具体国有资产管理工作发布部门规章的管理部门不包括( )。A.财政部 B.地方
重度有机磷中毒的主要症状是A.瞳孔明显缩小,大汗,流涎,视物模糊 B.瞳孔明显
Thechangeinthatvillagewasmiraculou
A.控制的标准必须是统一的、合理的 B.有效控制系统应是合理、适用的 C.控
可溶性岩石包括()。 A.石灰岩、大理岩、砂岩 B.硫酸岩类岩石、卤素类岩石
案例三: 一般资料:求助者,男性,28岁,公务员。受婚恋困扰,伴有睡眠困难,食
最新回复
(
0
)