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
6
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
Aftertheinvestigation,itwasconcludedthattheoldmanwasresponsiblefort
RisingInequalityIsHolding
ThegeneralelectioninBritainisheldevery______years.A、fourB、threeC、sixD、
Whencanpeoplethinkaboutoureyesveryoften?Onthetimewhenwe______.[br]
"见肝之病,知肝传脾,当先实脾"强调的是A.早期诊断 B.先安未受邪之地 C
在变电站内使用起重机械时,应安装接地装置,接地线应用多股软铜线,其截面应满足接地
一场雨,一泓凉意,落叶画出的涟漪似心中的承诺,不能平复只有漂泊;那一次相遇,一个
下列关于土地所有权权能的说法中,错误的是()。A.土地所有权和土地占有权既可
巴塞尔委员会根据英国银行家协会、国际掉期和衍生品交易协会、风险管理协会及普华永道
信达银行每年都依据实际业绩编制预算。2016年底信达银行在某地开设了一家分行,该
最新回复
(
0
)