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
What does the speaker say about the ocean’s level of saltiness?
What does the speaker say about the ocean’s level of saltiness?
admin
2010-04-24
8
问题
What does the speaker say about the ocean’s level of saltiness?
Scientists believe that when the oceans were young, they contained only a trace of salt, and that the level of salinity has been going up gradually. Over the years, rains have been wearing away the reek mantle of the continent. Minerals released by these erosion have been carded to the sea by the flow of river water. This water adds several billions tons of salt to the ocean annually. There are other sources of oceanic salinity too; one source is underwater volcanic action. These eruptions occurred along the mid-ocean ridge and release great amount of salt into the sea each year. However, these sources don’t increase the actual mineral composition of the water by much because the enormous chemical requirements of marine life. Oysters, clams, snails and other mollusk use salt to build shells and skeletons. Coral reefs also consume large amount of salt. Also, some salt leaves the ocean through the process of evaporation. As salts escape into the atmosphere, they go into the creation of rain drops, this is why the coast receives more rain. Salt exists in the atmosphere near the ocean, thereby attracting the increased moisture and producing rain.
选项
A、The level of saltiness in the ocean is extraordinarily high.
B、The average level of salinity in the ocean is higher than that of inland lakes.
C、Salt has been gradually accumulating in the ocean, which leads to a rise in oceanic salinity level.
D、Salt has accumulated very quickly at the early stage of life formation, then this process gradually slow down.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/C62K777K
0
专业英语四级
相关试题推荐
Failuretofollowtheclubrules________himfromthevolleyballteam.
Thewaythatpeoplespendtheirmoney,andtheobjectsonwhichtheyspendit,arethelastareaswherefreechoiceandindi
WhichofthefollowingstatementsisCORRECT?Accordingtothepassageitiscommonlybelievedthatbraindifferencesarecause
ThePonyExpressIntheUnitedStatestoday,wecansendaletterfromcoasttocoastinjustafewdaysforwellunderhal
Tomeettheeverincreasingdemand________oil-refiningequipment,thecompanywillproducemoreofsuchequipment.
Applicationshavepouredin_________assignmentstoremoteregionsofthecountry.
Inmycountry,the________arealldistributedfree.
TheUkrainenationallawmakershavedemanded______.
HowmanyMcDonald’srestaurantsnowofferspecialtydrinks?
HowmanyMcDonald’srestaurantsnowofferspecialtydrinks?
随机试题
A.肾动脉造影B.尿β2微球蛋白C.内生肌酐清除率D.放射性核素99mTc-MAG3测定E.放射性核素肾图反映肾血流量
下列哪项不是缩窄性心包炎的体征
具有祛瘀定痛,活血止血功用的方剂是具有活血祛瘀,行气止痛功用的方剂是
目前我国以单利计息的经济活动是()。
下列各项中,应列入利润表“营业收入”项目的有()。
采用成本法核算长期股权投资,下列各项中会导致长期股权投资账面价值发生增减变动的有()。
办公室温度,应该控制在()。
(2013年北京师范大学)京师大学堂。
OneafternoonIwassittingatmyfavoritetableinarestaurant,waitingforthefoodIhadordered.SuddenlyI【C1】______thata
IfenvironmentaltrendsinWesternnationscontinueonapositivetrack,somedaychildrenmayask,"Mommy,whatwaspollution?"
最新回复
(
0
)