首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The ocean is still salty. Evaporated water leaves the salt behind, which makes the ocean salty. How did oceans form? It is said
The ocean is still salty. Evaporated water leaves the salt behind, which makes the ocean salty. How did oceans form? It is said
admin
2021-03-27
105
问题
The ocean is still salty.
Evaporated water leaves the salt behind, which makes the ocean salty.
How did oceans form?
It is said that ocean formed at least【D6】________ago.
Atmosphere and clouds on the Earth are gases, such as water vapour escaping from the planet’s interior.
Were oceans in the past as salty as they are today?
Oceans were not so salty in【D7】________ state.
With the initial rains sweeping over the planet’s 【D8】________ and filtering down to the hollows, materials containing ingredients of salt were picked up.
Chlorine, came from the solid and gaseous fallout of land and【D9】________volcanoes.
The oceans’ salt content increases because of the steady flow of chemical-rich rivers and streams and the【D10】________of volcanoes and undersea vents.
【D8】
I know why the ocean is still salty: evaporated water leaves the salt behind. But how did it get salty in the first place?
According to one hypothesis, oceans formed at least 500 million years ago when water vapour and other gases escaping from the Earth’s interior gradually formed the atmosphere and clouds surrounding the planet. As the earth cooled below the boiling point of water, rain began to fall, and kept falling for centuries. Eventually the rainfall filled the Earth’s hollows and formed oceans.
In their infant state these oceans were not nearly as salty as they are today. As the initial rains swept over the planet’s surface and filtered down to the hollows, the rushing waters picked up chemicals from erosion of the Earth’s crust. These chemicals included sodium, which is one of the main ingredients of salt. The other main ingredient, chlorine, came from the solid and gaseous fallout of land and ocean floor volcanoes. Over hundreds of millions of years, the steady flow of chemical-rich rivers and streams and the eruption of volcanoes and undersea vents combined to increase the ocean’s salt content.
This does not mean, however, that the oceans’ saltiness is constantly increasing. Scientists believe that ocean salinity reached plateau hundreds of millions of years ago, when roughly the same amount of salt fed into the oceans was deposited as sediment on the ocean floor.
选项
答案
surface
解析
转载请注明原文地址:https://kaotiyun.com/show/dPfK777K
本试题收录于:
A类竞赛(研究生)题库大学生英语竞赛(NECCS)分类
0
A类竞赛(研究生)
大学生英语竞赛(NECCS)
相关试题推荐
Aseveryschoolboyknows,insectspollinateflowers,whilebirdsandmammalsdisperseseedsbyeatingfruitsortransportingbur
Whatcoloroflightissaidtoespeciallyaffectsleep?
Maleandfemaleloonstendtoact______activelyhelpingeachotherforageforfoodtofeedtheiryoung.
Activelearningoccurswhenalearnertakessomeresponsibilityforthedevelopmentoftheactivity,emphasizingthatasenseof
Oneday,whileatworkinthecoalmine,Ihappenedtooverheartwominerstalkingaboutagreatschoolforcoloredpeoplesomewh
Whatarethespeakersmainlytalkingabout?
Whatistheminimumnumberofmatchesyoucanremovefromthisdiagramtoleavejust2squares?
Whatis/arethemaindifficultyQatarfacesinhostingthe2022WorldCup?
Whataddedtothedifficultyintheputtingoutofthebushfire?
A、Hecandrivethereinlessthan20minutes.B、Thetrafficisveryheavyatthistimeoftheday.C、Themuseumisnotopentoda
随机试题
下列关于会计专业职务的聘任,说法正确的有()。
(2020年青岛)2016年教育部发布《中国学生发展核心素养》框架,该框架包括()
某场地经工程勘察后,证实该场地为饱和均质土层,但土质较软。为了提高地基承载力,减少基础沉降量,建议设计部门采用()。
现代工程咨询采用的系统研究是系统分析方法的一个步骤,其基本过程可归纳为()等几个阶段。
背景某钢厂将一条年产100万t宽厚板轧制生产线的建设项目,通过招标方式,确定该项目中的板坯加热炉车间和热轧制车间交由冶金施工总承包一级资质的企业实施总承包,负责土建施工,厂房钢结构制作、安装,车间内300t桥式起重机的安装,设备安装与调试,三电工
对于企业负债,一般规定偿还期在3年以上的借款为长期负债。()
两次世界大战之问过渡性的储备体系是单元化的。()
剩余价值和利润的关系是()
OneofthemostbasicmoralvaluesforAmericansis【C1】_______.Thewell-known【C2】______aboutGeorgeWashingtonandthecherryt
StudentsinAustraliabetweentheagesof6and15canenjoy______education.
最新回复
(
0
)