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
21
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://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
ConsumerporcelainsinJingdezhenarenotsellingwellinexportmarketascompa
—Ilikeyourfurnitureverymuch.—Thankyou.Webought______inDenmark.A、the
PASSAGETHREE[br]Whatkindofabilityshouldonehavetosolvehislife’sprob
Wecanexperiencestressanytimewefeelwedon’thave【B1】______.Itcanc
证券公司申请介绍业务,应当向中国证监会提交全资拥有或者控股期货公司,或者与期货公
端子箱及检修电源箱验收包括可研初设审查、()两个关键环节。启动验收$;
“一个好媳妇,三代好子孙”,媳妇好不好,上台夸夸就知道。每年春天,X市Y区各个乡
丸剂是中药传统剂型之一,至今在中成药中仍占有重要地位。包衣是中药丸剂的一大特色,
根据会计法律制度的规定,对于尚不构成犯罪的伪造、变造会计凭证行为,需要承担的行政
设备基础常见质量通病不包括( )。A.预埋地脚螺栓的位置、标高超差 B.预留
最新回复
(
0
)