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
2024-01-11
28
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] The passage is chiefly concerned with
选项
A、explaining the process by which the Earth and its oceans accreted
B、reporting how recent research has arrived at a new explanation for the constitution of the Earth’s oceans
C、accounting for the chemical composition of the various ingredients of the Earth’s oceans
D、contrasting various competing hypotheses as to what the Earth’s oceans consist of
E、reporting inconsistencies with the result of new research into the composition of the Earth’s oceans
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3352940.html
相关试题推荐
Newtheoriesproposethatcatastrophicimpactsofasteroidsandcometsmayhave
Inadditiontoconventionalgalaxies,theuniversecontainsverydimgalaxiesth
Inadditiontoconventionalgalaxies,theuniversecontainsverydimgalaxiesth
ThedrymountainrangesofthewesternUnitedStatescontainrocksdatingback4
ThedrymountainrangesofthewesternUnitedStatescontainrocksdatingback4
Sixty-eightpeoplearesittingin20carsandeachcarcontainsatmost4people
Acylindricalcanofpineapplejuicecontains350cm3ofliquid.Ifthecanis1
Abowlcontains20marbles(8blue,6red,3green,2yellow,and1orange).If
Ifasmallsodacancontains300mlofsoda,howmanylitersofsodaarein25c
Abagcontains3red,4white,and5bluemarbles.Jasonbeginsremovingmarbles
随机试题
Shesawtheadvertisementandwrotealetterloapplyforthe______.A、occupatio
冷却液是汽车发动机不可缺少的一部分。它在发动机冷却系统中循环流动,将发动机工作中
下列不属于特高压交流系统输电能力计算方法的是()。A.静态功角稳定计算方法
根据代理权产生的根据不同,可以将代理分为( )三类。A.委托代理、法定代理和指
患者,男,14岁。高热,头痛,呕吐。检查:脑膜刺激征(+),脑脊液压力高,含大量
石方路基实测项目有()。A、压实度 B、纵断高程 C、中线偏位 D、路拱横
关于房地产产品建筑策划定位法的流程,下列选项中正确的是()。A:目标规模设定→
A. B. C. D.
新时期统一战线大陆范围内的联盟,是以爱国主义和社会主义为政治基础的,联盟包括
关于施工现场环境噪声污染防治的说法,正确的是()。 A.国家对环境噪
最新回复
(
0
)