首页
登录
职称英语
In this section, you will hear a short passage. For questions 21—30, complete th
In this section, you will hear a short passage. For questions 21—30, complete th
游客
2023-10-13
37
管理
问题
In this section, you will hear a short passage. For questions 21—30, complete the notes using no more than three words for each blank. The passage will be read only once. Remember to write the answers on the answer sheet.
-The ocean is still salty.
-Evaporated water leaves【D1】______behind, which makes the ocean salty.
-How did oceans form?
- It is said that oceans formed at least【D2】______ago.
- Atmosphere and clouds on the Earth are gasses, such as【D3】______ escaping from the planet’s interior.
-Were oceans in the past as salty as they are today?
-Oceans were not so salty in【D4】______state.
-With【D5】______ sweeping over the planet’s【D6】______and filtering down to the hollows , materials containing ingredients of salt were picked up.
- Chlorine, came from the【D7】______and gaseous fallout of land and【D8】______volcanoes.
-The oceans’ salt content increases because of the steady flow of【D9】______and streams and the【D10】______of volcanoes and undersea vents. [br] 【D2】
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 year ago when water vapor and other gasses escaped 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 the 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
500 million years
解析
(录音中谈及了一种假想,即海洋形成于5亿年前,所以对应该空应填写500 million years。)
转载请注明原文地址:https://tihaiku.com/zcyy/3093302.html
相关试题推荐
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresour
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresour
考试题保密以防作弊。(keepsecret)Thetestquestionsarekeptsecretsoastopreventcheat
Completethepuzzlewithwordsrelatedtothemedia.[img]2016m12s/ct_eyyjsbz201
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresour
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresour
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresour
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresour
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresour
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresour
随机试题
Insomeways,theUnitedStateshasmadespectacularprogress.Firesnolong
WhichofthefollowingisNOTtrueaboutonlinemarketplaces?[br][originaltex
Wecanacceptyourorder______(在预先付款的条件下).onconditionthatpaymentismadeina
A企业为矿山企业,地下金属矿山采用竖井、斜井、斜坡道联合开拓方式和下行分层胶结充
预测事件的变化主要不是受技术、收入等客观因素影响,而是受政策、方针、个人意志等因
影响群体决策的群体因素有()A:群体熟悉度 B:群体多样性 C:参与决策程度
.恩格斯指出,所谓“社会主义”不是一种一成不变的东西,而应当和任何其他社会制度一
A、B、C、D、E、F六个小朋友做游戏,每轮游戏都按照下面的箭头方向把原来手里的
下列不属于巴尼提出的成为异质性资源必备特征的是()。A.有价值性 B.稀缺性
在沉降作用明显的河流充分混合段,对排入河流的化学需氧量(COD)进行水质预测最适
最新回复
(
0
)