首页
登录
职称英语
【B1】 [br] 【B2】 [originaltext]The origin of Earth’s moon, the largest moon in the
【B1】 [br] 【B2】 [originaltext]The origin of Earth’s moon, the largest moon in the
游客
2023-07-13
9
管理
问题
【B1】 [br] 【B2】
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 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 in formation, 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
答案
Consistent
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/2832584.html
相关试题推荐
[originaltext]Narcissus,ahandsomeyoungman,waswalkingthroughthewood
[originaltext]Narcissus,ahandsomeyoungman,waswalkingthroughthewood
[originaltext]Narcissus,ahandsomeyoungman,waswalkingthroughthewood
[originaltext]Insomecountriescertainkindsofinsurancearecompulsory.
[originaltext]Insomecountriescertainkindsofinsurancearecompulsory.
[originaltext]W:Dr.Carter’sOffice.M:Yes,I’dliketomakeanappointmentt
[originaltext]Itwasnotuntilonehundredandfiftyyearsagothatscienti
[originaltext]Itwasnotuntilonehundredandfiftyyearsagothatscienti
[originaltext]Itwasnotuntilonehundredandfiftyyearsagothatscienti
[originaltext]Itwasnotuntilonehundredandfiftyyearsagothatscienti
随机试题
Ahotelislikeaself-containedcommunityprovidingguestswithalltheservice
以下关于进度管理工具图的叙述中,不正确的是()。A.能清晰地表达每个任务的开始
下列说法体现唯物主义与唯心主义两种对立观点的是()。A、削足适履和指鹿为马
患者,男性,35岁。右大腿刺伤行局部缝合术,术后第4天突然出现右大腿剧烈疼痛,局
国际货运业是国际商品贸易的重要组成部分。下图为国际货运网点分布图。 下列地
多数重症肌无力的患者会合并存在的疾病是A.消化性溃疡 B.系统性红斑狼疮 C
A.13 B.28 C.33 D.49
商业银行可以向企业发放流动资金贷款用于其固定资产投资。()
A.热性药 B.干性药 C.湿热性药 D.湿寒性药 E.寒性药维吾尔医中
无压管道在下列()工作之一合格后应及时回填。A.闭水试验 B.水压试验
最新回复
(
0
)