首页
登录
职称英语
Comets are now known to contain twice as many atoms of deuterium to
Comets are now known to contain twice as many atoms of deuterium to
游客
2025-02-22
15
管理
问题
Comets are now known to contain twice as many atoms of deuterium to
each atom of ordinary hydrogen found in seawater. Scientists have also
discovered that meteorites could not solely have delivered the water in the
Line ocean, for then the earth’s atmosphere would contain nearly 10 times as much
(5) xenon as it actually does, given that meteorites carry excess xenon. Hence, the
best model for the source of the oceans at the moment is a combination of water
derived from comets and water caught up in the rocky body of the earth as it
formed. This mixture satisfies both the xenon and deuterium problem, the
latter especially if the rocky material out near the earth’s present orbit
(10) collected some regularly composed local water from the solar nebula before they
accreted to form the earth. New laboratory studies have indicated that the
water vapor in the solar nebula would have had a low enough proportion of
deuterium to complement the excess deuterium found in comets. [br] Which of the following, if true, would cast the MOST doubt on scientists’ most recent explanation for the origin of the ocean’s water?
选项
A、Meteorites contain only twice, and not ten times as much xenon as regular sea water.
B、Local water from the solar nebula is found to contain as much xenon as meteorites.
C、Water from the solar nebula contains less deuterium than was previously thought.
D、Comets containing more than twice the amount of deuterium than was previously thought.
E、More than twice as many meteorites as comets existed in the solar system at the time of the Earth’s formation.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3967504.html
相关试题推荐
Cometsarenowknowntocontaintwiceasmanyatomsofdeuteriumto
Cometsarenowknowntocontaintwiceasmanyatomsofdeuteriumto
Cometsarenowknowntocontaintwiceasmanyatomsofdeuteriumto
Cometshavebeenmistakenlyinterpretedbyhumansintimespastas______ofdoom,
Skincontainsmillionsofsensoryreceptorswhichinformthebrain,throughelec
Themagazinearticlediscussingthegovernor’sfinancialdealingscontained(i)_
AlthoughA.S.Byatt’sstoriesareelaborateandsometimescontainsupernaturale
Aninfluentialearlyviewheldthatecosystemscontainnichesforalimitednumb
Aninfluentialearlyviewheldthatecosystemscontainnichesforalimitednumb
Astronomerswhostudyplanetformationoncebelievedthatcomets—becausethe
随机试题
ManyadvocatesofauniversalhealthcaresystemintheUnitedStateslookto
PASSAGETWO[br]Wherehasthe"FiveWishes"livingwillbeenrecognizedwidely
[originaltext]M:I’mAviArditti,andthisweekonWordmaster.wehaveaspecia
Goodmorning,everyoneandwelcometotheEnglishforAcademicPurposesCent
政府机构具有相对独立性,是指政府机构在实施行政管理行为时,可以不受任何制约,按自
原发性肝癌普查最常先用A.CT B.MRI C.AFP D.AKP E.
下列关于金融互换市场的说法,错误的是()。A.互换中可以包含两个以上的当事人
试论述如何运用记忆规律促进知识保持。
关于“意志缺乏”,下列说法中不正确的是()。 (A)生活极端懒散(B
最新回复
(
0
)