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
37
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
Beds of rock salt are found in every part of the world.
A:Right
B:Wrong
C:Not mentioned
答案
A
解析
转载请注明原文地址:https://ti.zuoweng.com/ti/6klQKKKQ
相关试题推荐
共用题干 RiseinNumberofCancerSurvivorsCanceristhesecondleadingcauseof...
共用题干 RiseinNumberofCancerSurvivorsCanceristhesecondleadingcauseof...
共用题干 FemaleBullfightingItwasaunique,eye-catchingsight:anattractivewom...
共用题干 FemaleBullfightingItwasaunique,eye-catchingsight:anattractivewom...
共用题干 FemaleBullfightingItwasaunique,eye-catchingsight:anattractivewom...
共用题干 第三篇GlobalCancerRatestoRiseby50%by2020Thenumberofnewcancerc...
共用题干 第三篇GlobalCancerRatestoRiseby50%by2020Thenumberofnewcancerc...
共用题干 SleepLetsBrainFileMemoriesTosleep.Perchancetofile?Findingspubli...
共用题干 第三篇ScientificAttitudeWeallknowthatscienceplaysanimportantrole...
共用题干 第三篇ScientificAttitudeWeallknowthatscienceplaysanimportantrole...
随机试题
在国际货币体系变迁的过程中,曾出现过的国际货币体系有( )。 A、金银复本
在货币流通规律中,货币需求量M与其他相关变量的关系正确的是()。
干地施工时,必须做好基坑的防水、排水和()保护。
收购人在报送上市公司收购报告书之日起()日后,公告其要约收购报告书、财务顾问专业
一妇女孕3个月,诉近来呼吸困难来诊,查体见甲状腺体较大,脉搏105次/分,两手颤
党的十六大明确指出:“坚持党的思想路线,解放思想、实事求是、与时倶进,是我们党坚持先进性和增强创造力的决定因素。”解放思想、实事求是、与时俱进、求真务实四...
某高中艺术班的学生都参加了专业课的课外辅导,在参加了专业课课外辅导的学生中有60%的学生还参加文化课的课外辅导。只有参加了文化课的课外辅导的学生才会每周六...
《中国药典临床用药须知》媿定必须做皮肤敏感试验的药品是A.天花粉蛋白B.链霉素注射剂C.苯唑西林注射剂D.注射甩头孢菌素E.细胞色素C注射剂
下列行为中,可以确立大强和小梅之间存在合法夫妻关系的是()。A:大强和小梅请全村人喝喜酒B:大强和小梅以夫妻名义共同生活满8年C:大强和小梅生下孩子小强D
价格领导形式通常包括( )。A.成本最高型价格领先B.支配型价格领先C.成本最低型价格领先D.晴雨表型价格领先E.消费型价格领