首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
共用题干 Where Has the Salt Come from?Every now and then,we meet a fact about ou...
共用题干 Where Has the Salt Come from?Every now and then,we meet a fact about ou...
admin
2020-12-24
42
问题
共用题干
Where Has the Salt Come from?
Every now and then,we meet a fact about our earth that makes us feel strange and no
answer for the fact has yet been found.Such a fact is the existence of salt in the oceans.
How did it get there?
We simply do not know how the salt got into the ocean!We do know,of course,that
salt is water-soluble,and so passes into the oceans with rainwater.The salt of the earth's
surface is constantly being dissolved(溶解)and is passing into the ocean.
But we do not know whether this can explain the huge quantity of salt in oceans.If all
the oceans were dried up,enough salt would be left to build a wall 180 miles high and a
mile thick. Such a wall would reach once around the world at the Equator(赤道)!
The common salt that we all use is produced from seawater or the water of salt lakes,
from salt springs(源泉)and from deposits of rock salt. The concentration(浓度)of salt in
seawater ranges from about three percent to three-and-one-half percent. The Dead Sea,
which covers an area of about 340 square miles,contains about 11,600,000,000 tons of
salt!
On the average, a gallon(加仑)of seawater contains about a quarter of a pound of
salt.The beds of rock salt that are found in various parts of the world were all originally
formed by the evaporation(蒸发)of seawater millions of years ago. It is believed that the
thick rock-salt deposits were formed after about nine-tenth of theY volume of seawater had
been evaporated.
Most commercial salt is obtained from rock salt.The usual method is to drill wells(井)
down to the salt beds. Pure water is pumped down(抽进去)through a pipe. The water
dissolves the salt and it is forced through another pipe up to the surface.
选项
A:Right
B:Wrong
C:Not mentioned
答案
B
解析
转载请注明原文地址:https://ti.zuoweng.com/ti/nklQKKKQ
相关试题推荐
共用题干 RiseinNumberofCancerSurvivorsCanceristhesecondleadingcauseof...
共用题干 RiseinNumberofCancerSurvivorsCanceristhesecondleadingcauseof...
共用题干 RiseinNumberofCancerSurvivorsCanceristhesecondleadingcauseof...
共用题干 FemaleBullfightingItwasaunique,eye-catchingsight:anattractivewom...
共用题干 第三篇GlobalCancerRatestoRiseby50%by2020Thenumberofnewcancerc...
共用题干 SleepLetsBrainFileMemoriesTosleep.Perchancetofile?Findingspubli...
共用题干 SleepLetsBrainFileMemoriesTosleep.Perchancetofile?Findingspubli...
共用题干 SleepLetsBrainFileMemoriesTosleep.Perchancetofile?Findingspubli...
共用题干 SleepLetsBrainFileMemoriesTosleep.Perchancetofile?Findingspubli...
共用题干 SleepLetsBrainFileMemoriesTosleep.Perchancetofile?Findingspubli...
随机试题
院前创伤包扎错误的叙述是 A.要防止滑脱 B.包扎四肢时,应将指(趾)端封闭
关于单代号搭接网络计划时距的说法,正确的是( )。
目前,我国内地存在的各类利率、汇率、黄金甚至股票价格指数联结型外汇理财产品和人民
建设单位是建筑工程的投资主体,在建筑活动中居于主导地位。依据《建设工程安全生产管
共集电极放大电路如图所示,三极管的输入电阻和电流放大倍数为已知数,该放大器的电压
(2006年真题)根据法律规定,下列民事主体中享有优先购买权的是( )。 A
统计从业资格认定制度是针对在国家机关、社会团体、企业事业单位和其他组织等统计调查对象中承担统计调查任务的人员,从事统计工作提出的专业资格要求。
人参的主治病证A.消渴B.惊悸健忘C.肺气虚弱D.脾气虚弱E.气虚欲脱
某化工公司粗苯产品装车采用压缩气体压送。压缩气源应选用( )。A.氮气B.氧气C.氢气D.空气
下列有关控制环境对评估财务报表层次重大错报风险的影响的说法中,错误的是( )。A、薄弱的控制环境带来的风险可能对财务报表产生广泛影响B、财务报表层次的重大错报