首页
登录
职称英语
[originaltext] We are going to talk today about the moon, our moon. First of
[originaltext] We are going to talk today about the moon, our moon. First of
游客
2024-01-05
6
管理
问题
We are going to talk today about the moon, our moon. First of all, the earth’s moon is unusual. Why? It’s larger than other moons or satellites in the solar system, in relation to its planet that is. Its diameter is more than a quarter that of the earth. And if you compare the earth and the moon in terms of substance, you find the moon isn’t much like the earth. For example, the earth has a significant iron core, but the moon contains very little heavy materials like iron. That’s why its density is much lower than that of the earth. Now, one time it was believed that the moon and the earth were formed at the same time from the same material. But then wouldn’t the moon have as much iron as the earth? Another theory is that the moon was formed elsewhere in the solar system, and then it was captured, sort of speak, by earth. But study shows that the young earth would not have had enough gravitational force to stop a body the size of a moon from traveling through the solar system and pull it into orbit. The newest theory is called the big splash theory. Here, the new young earth was hit by another big planet. Most of the colliding planet entered the earth and became part of it. But the huge impact created a vapor that shed out into space and eventually condensed as the moon. Because this material came mostly from the earth surface crust, not the iron core, the moon contains almost no iron. Well, as plausible as it sounds, it’s only a theory, and we can’t be sure that this is what really happened, that this is how the moon originated. Plenty of research remained to be done.
选项
A、The Moon has no water
B、The Moon’s materials came from Earth’s core
C、The Moon’s core differs from its surface
D、The Moon contains little iron
答案
D
解析
What?information?about?the?moon’s?composition?helps?support?the?big?splash?theory?
转载请注明原文地址:https://tihaiku.com/zcyy/3334739.html
相关试题推荐
TheTreloarValleypassengerferry[originaltext]Narrator:Youwillhearpartof
Choosethecorrectletter,A,BorC.[br]Auniversityis[originaltext]GEOFFRE
Choosethecorrectletter,A,BorC.[br]Itisdangerousto[originaltext]GEOF
Choosethecorrectletter,A,BorC.[br]Theproposalwill[originaltext]TUTOR:
Choosethecorrectletter,A,BorC.[br]Thehostfamilieswill[originaltext]
WhydidAnitaandLeechoosetotalkaboutJohnChapman?[br][originaltext]You
WhydidAnitaandLeechoosetotalkaboutJohnChapman?[br][originaltext]You
WhydidAnitaandLeechoosetotalkaboutJohnChapman?[originaltext]Youwill
WhatdoesthecharityForwardthinkingdo?[br][originaltext]Youwillhearar
WhatdoesthecharityForwardthinkingdo?[br][originaltext]Youwillhearar
随机试题
Courtesyalsoincludesproperbehavioronthestreet.Properstreetbehavio
[originaltext]"Hightech"and"stateoftheart"aretwoexpressionsthatd
"HewWomenoftheIceAge"Thestatusofwomeninasocietydependsinlarge
Thetimeofyearababyisborncanshapewhatprofessiontheywillembarko
Improvingthebalancebetweentheworkingpartofthedayandtherestofit
下列说法中正确的是: Ⅰ、与上年相比,2001年至2003年我省进口总值
估值方法的()是指基金在进行资产估值时均应采取同祥的估值方法,遵守同样的
以下对金融远期合约说法正确的是()。 ①交易可协商 ②存在对手违约风险
素有滑胎病史的病人,孕后保胎治疗的时间一般需超过既往流产月份的A.1周 B.2
海关权力属于行政权力,与其他国家权力和社会组织.个人的权利不同,主要有( )A
最新回复
(
0
)