首页
登录
职称英语
In 1831 when Smith was finally recognized by the Geological Society of Londo
In 1831 when Smith was finally recognized by the Geological Society of Londo
游客
2025-02-05
17
管理
问题
In 1831 when Smith was finally recognized by the Geological Society of London as the "father of English geology," it was not only for his maps but also for something even more important. Ever since people had begun to catalog the strata in particular outcrops, there had been the hope that these could somehow be used to calculate geological time.
But as more and more accumulations of strata were cataloged in more and more places, it became clear that the sequences of rocks sometimes differed from region to region and that no rock type was ever going to become a reliable time marker throughout the world.
Even without the problem of regional differences, rocks present a difficulty as unique time markers.
Quartz is quartz
—a silicon ion surrounded by four oxygen ions—there’s no difference at all between two-million-year-old Pleistocene quartz and Cambrian quartz created over 500 million years ago. [br] Why does the author use the phrase "
Quartz is quartz
"?
选项
A、To describe how the differences between Pleistocene and Cambrian quartz reveal information about dating rocks
B、To point out that the chemical composition of quartz makes it more difficult to date than other rocks
C、To provide an example of how regional differences in rock sequences can make a particular rock difficult to date
D、To explain that rocks are difficult to use for dating because their chemical compositions always remain the same over time
答案
D
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3944555.html
相关试题推荐
In1831whenSmithwasfinallyrecognizedbytheGeologicalSocietyofLondo
In1831whenSmithwasfinallyrecognizedbytheGeologicalSocietyofLondo
"HewWomenoftheIceAge"Thestatusofwomeninasocietydependsinlarge
"HewWomenoftheIceAge"Thestatusofwomeninasocietydependsinlarge
"HewWomenoftheIceAge"Thestatusofwomeninasocietydependsinlarge
"HewWomenoftheIceAge"Thestatusofwomeninasocietydependsinlarge
"HewWomenoftheIceAge"Thestatusofwomeninasocietydependsinlarge
AgriculturalSocietyinEighteenth-CenturyBritishAmericaP1:Throughouttheco
AgriculturalSocietyinEighteenth-CenturyBritishAmericaP1:Throughouttheco
AgriculturalSocietyinEighteenth-CenturyBritishAmericaP1:Throughouttheco
随机试题
Earlyanthropologists,followingthetheorythatwordsdeterminethought,b
Itisoftensaidthatpolitenesscostsnothing.Infact,itseemsthatalit
BenBuchananandAMagicBookTheTexasteenisdevouri
甲股份有限公司(以下简称甲公司)是一家从事能源化工生产的公司,S集团公司拥有甲
施工定额是典型的生产性定额。()
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性: A.如
阅读材料,完成下列要求。 某知名京剧演员在微博上发布工作剧照并附言:“这一头点
下列各项,不属"痒"病因的是A.血瘀 B.热胜 C.湿胜 D.虫淫
工作票由设备运维管理单位签发,也可由经设备运维管理单位()的检修及基建单位签发。
玉佩:荷包()A.国画:水墨 B.走马灯:灯笼 C.管乐:圆号 D.长镜
最新回复
(
0
)