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
85
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.
【D9】
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
ocean floor
解析
转载请注明原文地址:https://kaotiyun.com/show/pPfK777K
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
Atuniversityyouwillhavetowriteoftenandinvariousdifferentformats,dependonthesubjectsyouarestudying.Themostc
Despitethechokingsmog,Beijingisstillthenumberonechoiceforgraduatejobseekersbasedonits"softenvironment",acco
Readthefollowingpoemandwriteanessayinwhichyoudiscussitsmoralandexpressyourpersonalviews.
A、Inafilmprocessingshop.B、Inaphotocopyshop.C、Inabookshop.D、Atthecinema.B对话中女士让男士保留it的原色彩,并说it是从美术书中得来的,可推断it为图片,而
Whatisthemangoingtododuringthesummer?
Whatisthenewsitemmainlyabout?
Marijuana(大麻)isagreen,brown,orgraymixtureofdried,shreddedleaves,stems,seeds,andflowersofthehempplant(Cannab
Whatistheminimumnumberofmatchesyoucanremovefromthisdiagramtoleavejust2squares?
A、She’llcallthemanintenminutes.B、She’llmeetthemanafterworkC、Sheacceptshisinvitation.D、Sheforgetstobringher
随机试题
张某设立的甲个人独资企业解散,乙公司是甲企业的债权人,甲企业清算结束,解散后,乙公司的债权未得到清偿,下列说法正确的是:()
A.蚯蚓头B.砂眼C.疙瘩丁D.起霜E.星点银柴胡的性状鉴别特征是
细胞凋亡的生物化学改变中,错误的是
危重、急症病人抢救多选用的给药途径是
李先生在甲公司工作了8年,2019年1月与该单位解除聘用关系,取得一次性补偿收入100000元。甲公司所在地上年平均工资为8000元。李先生的补偿收入应缴纳个人所得税()元。
下列历史事件按时间排序排列正确的一组是()。
在软件设计中不使用的工具是()。
•Readthetextbelowaboutmarketinginformation.•Inmostofthelines34—45thereisoneextraword.Itiseithergrammatica
Thepreservedfoodshouldretainpalatableappearance,flavor,andtexture,aswellasitsoriginalnutritionalvalue.
MysummrholswrCWOT.B4,weusd2go2NY2Cmybro,hisGF&thr3:-@kidsFTF,ILNY,itsgr8.Canyouunderstandthisse
最新回复
(
0
)