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
9
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] 【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://tihaiku.com/zcyy/3706096.html
相关试题推荐
Whichonebelowissaidtobeevenmoresevereaboutleft-behindchildren?[br]
Whichonebelowissaidtobeevenmoresevereaboutleft-behindchildren?[br]
Whichonebelowissaidtobeevenmoresevereaboutleft-behindchildren?[br]
Whichonebelowissaidtobeevenmoresevereaboutleft-behindchildren?[orig
Marijuana(大麻)isagreen,brown,orgraymixtureofdried,shreddedleaves,
Marijuana(大麻)isagreen,brown,orgraymixtureofdried,shreddedleaves,
Whenheleavesthecompanynextyear,he_______forthiscompanyforthirtyyears
Whenheleavesthecompanynextyear,he__________forthiscompanyforthirtyye
Theoceanisstillsalty.Evaporatedwaterleavesthesaltbehind,whichmakest
Theoceanisstillsalty.Evaporatedwaterleavesthesaltbehind,whichmakest
随机试题
Ifsustainablecompetitiveadvantagedependsonworkforceskills,American
高倍数泡沫产生器进口端泡沫混合液管道的水平支管上不宜设置()。A.压力表
水基型灭火器包括清水灭火器、泡沫灭火器和CO2灭火器。
我国现行《混凝土结构设计规范》中,预应力钢绞线、钢丝和热处理钢筋的强度标准值由以
女,25岁,活动后气急5年,夜间不能平卧、痰中带血1个月,近1天咳较多白色泡沫痰
经济较不发达阶段,政府往往更强调产业布局的()。A.公平性 B.竞争性 C
我国的《护士条例》中规定了护士的权利和义务。在以下的护士享有的权利的诉讼中,不正
应按(____)年的基准周期进行MOV的1mA/柱直流参考电流下直流参考电压试验
起搏电流是指( )。A.INa B.ICa C.If D.Ito
为保障《条例》的实施,2012年10月29日,××省政府常务会议审议并原则通过了
最新回复
(
0
)