首页
登录
职称英语
【B1】 [br] 【B5】 [originaltext]The origin of Earth’s moon, the largest moon in the
【B1】 [br] 【B5】 [originaltext]The origin of Earth’s moon, the largest moon in the
游客
2024-02-14
24
管理
问题
【B1】 [br] 【B5】
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
Composed
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3448853.html
相关试题推荐
[originaltext]Chrisisinchargeofpurchasingandmaintainingequipmentin
[originaltext]Bowsandarrowsareoneoftheman’soldestweapons.Theygav
[originaltext]M:Right,let’sgetontothemarketingstrategy.W:Well,thema
[originaltext]M:Right,let’sgetontothemarketingstrategy.W:Well,thema
[originaltext]W:Tonyisthebestcross-countryrunnerwe’veeverhadinthiss
[originaltext]W:Tonyisthebestcross-countryrunnerwe’veeverhadinthiss
[originaltext]W:Tonyisthebestcross-countryrunnerwe’veeverhadinthiss
[originaltext]W:Tonyisthebestcross-countryrunnerwe’veeverhadinthiss
[originaltext]W:Tonyisthebestcross-countryrunnerwe’veeverhadinthiss
[originaltext]W:Tonyisthebestcross-countryrunnerwe’veeverhadinthiss
随机试题
[audioFiles]audio_ezf_m_0113(20101)[/audioFiles]Theweatherconcernsevery
()稀奇古怪的实验()美术[br]()规律重复()音乐、舞蹈和建
Theresearchersfindthattherearestrongerconnectionsbetween______.[br]T
[originaltext]M:Canwemakeyouanoffer?Wewouldliketorunthecampaignfo
Criticsofearlyschoolingciteresearchthatquestionswhether4-year-oldc
下列句子中,词语使用不当的是( )。A.只有坚持到底,才能取得成功 B.只要
在下图所示的网络配置中,发现工作站B无法与服务器A通信。(),故障影响了两者互
2018年1月1日,小王购买了甲公司于当日发行的3年期公司债券,债券面值为100
根据贷款安全性调查的要求,良好的公司治理机制包括( )。A.清晰的发展战略
方法研究是一种寻找最经济和最合理的工作程序和操作方法的管理技术,以下不属于方法研
最新回复
(
0
)