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
70
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://www.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
Therearethreekindsofgoals:short-term,medium-rangeandlong-termgoals
粉条的特点是________且________,较适合________和____
大学是人性格发展和成型的关键时期,抓住这一时期,促进大学生良好性格的完善和成熟,
室外低压配电线路应全线采用电缆()敷设,在入户处应将电缆的金属外皮、钢管接到电
风向频率玫瑰图中粗实线表示()风向。A.冬季 B.全年 C.夏季 D.春
企业弥补以前年度亏损后的剩余利润,可向股东分配股利。这一影响股利政策的因素是:A
闭合性肾损伤不应作下列哪些检查A.静脉肾盂造影 B.动脉造影 C.CT D
A.与相应的椎骨平面相差2节 B.与相应的椎骨平面相差1节 C.与相应的椎骨
苏联教育家苏霍姆林斯基说过:"如果你能让每一个学生在学校里抬起头来走路,那你就是
对被审计单位在金融机构的有关存款需要予以冻结的,审计机关应当向()提出申请。A
最新回复
(
0
)