首页
登录
职称英语
The ocean is still salty.Evaporated water leaves the salt behind, which makes t
The ocean is still salty.Evaporated water leaves the salt behind, which makes t
游客
2024-08-05
44
管理
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. [br] 【D7】
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
their infant
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3706095.html
相关试题推荐
Whichonebelowissaidtobeevenmoresevereaboutleft-behindchildren?[br]
Whichonebelowissaidtobeevenmoresevereaboutleft-behindchildren?[br]
Whichonebelowissaidtobeevenmoresevereaboutleft-behindchildren?[orig
Marijuana(大麻)isagreen,brown,orgraymixtureofdried,shreddedleaves,
Marijuana(大麻)isagreen,brown,orgraymixtureofdried,shreddedleaves,
Marijuana(大麻)isagreen,brown,orgraymixtureofdried,shreddedleaves,
Whenheleavesthecompanynextyearhe______forthiscompanyforthirtyyears.A
AnintrepidEskimoleaveshisiglooandtravels12kilometersnorth,12kilomete
Whenheleavesthecompanynextyear,he_______forthiscompanyforthirtyyears
Whenheleavesthecompanynextyear,he__________forthiscompanyforthirtyye
随机试题
•Youwillhearfivedifferentpeopletalkingabouttheirpresentjobs.•Foreach
A—bitB—bufferstorageC—cardreader
HowtoWriteChildren’sLiterature?TheauthorofDannytheDragonMeetsJimmyi
Ifyouweretobeginanewjobtomorrow,youwouldbringwithyousomebasicstr
M胆碱受体阻断药是A.胶体枸橼酸铋钾B.兰索拉唑C.雷尼替丁D.哌仑西平E.氢氧
某幼儿园大班2班的班主任齐老师为人十分傲慢,对幼儿更是不客气,讽刺、挖苦是常事。
症见咳嗽痰多,白色泡沫痰,喘息不能平卧,胸部膨满,憋闷如塞,面色紫黯,唇甲紫绀,
功用为解肌清热的方剂是A.加减葳蕤汤 B.升麻葛根汤 C.桂枝汤 D.香薷
企业转销无法支付的应付账款时,应将该应付账款账面余额计入()。 A.资本公积
安全文明施工及其他措施项目工作内容主要有()。A.环境保护 B.安全施工
最新回复
(
0
)