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
This view may be correct: it has the advantage that the currents are driven by temperature differences that themselves depend on
This view may be correct: it has the advantage that the currents are driven by temperature differences that themselves depend on
admin
2011-02-10
74
问题
This view may be correct: it has the advantage that the currents are driven by temperature differences that themselves depend on the position of the continents. Such a back-coupling, in which the position of the moving plate has an impact on the forces that move it, could produce complicated and varying motions.
On the other hand, the theory is implausible because convection does not normally occur along lines, and it certainly does not occur along lines broken by frequent offsets or changes in direction, as the ridge is. Also it is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean. This plate is growing on both sides, and since there is no intermediate trench, the two ridges must be moving apart. It would be odd if the rising convection currents kept exact pace with them. An alternative theory is that the sinking part of the plate, which is denser than the hotter surrounding mantle, pulls the rest of the plate after it. Again it is difficult to see how this applies to the ridge in the South Atlantic, where neither the African nor the American plate has a sinking part.
Another possibility is that the sinking plate cools the neighboring mantle and produces convection currents that move the plates. This last theory is attractive because it gives some hope of explaining the enclosed seas, such as the Sea of Japan. These seas have a typical oceanic floor, except that the floor is overlaid by several kilometers of sediment. Their floors have probably been sinking for long periods.
It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins. The enclosed seas are an important feature of the earth’s surface and seriously require explanation because, in addition to the enclosed seas that are developing at present behind island arcs, there are a number of older ones of possibly similar origin, such as the Gulf of Mexico, the Black Sea, and perhaps the North Sea.
It can be inferred from the passage that, of the following, the deepest sediments would be found in the ______.
选项
A、Black Sea
B、Indian Ocean
C、South Atlantic
D、Pacific
答案
A
解析
转载请注明原文地址:https://www.kaotiyun.com/show/UycO777K
本试题收录于:
NAETI中级口译笔试题库外语翻译证书(NAETI)分类
0
NAETI中级口译笔试
外语翻译证书(NAETI)
相关试题推荐
Nowasinglecellphoneisabletostorealarge______ofinformationaboutanindividuallife.
AsanEnglishmajorstudentatoneofthemostfamousuniversitiesinChina,IstronglybelievethatbusinessEnglishismorepr
Oneofthethingswehavetodotopreventapandemicistomakesurepeopleunderstandandknowwhattheycandotominimizeth
Nowwhicharetheanimalsreallytobepitiedincaptivity?First,thosecleverbeingswhoselivelyurgeforactivitycanfindn
Weregretbeingunabletoentertainyourrequestforprovidingfreeboardingto15sportsmenfortwoweeks.
Inthepopularmind,theInternetistherealizationoftheglobalvillage,wheretheflowofinformationandideasisunimpeded
OurGuiltySecretNexttimeyoupickupalunchtimesandwich,takeamomenttothinkaboutwhereithascomefrom.Thinkoft
Thewarm-heartedladyattemptedtocreatearomanticatmospherethatwouldbringthetwoyoungpeopletogetherin______.
There’sazaninessaboutbitcoin.Thecurrencyisbuiltonaweirdmixofthemostold-fashionedkindofspeculativegreed,bols
Theeconomymaybetroubled,butoneareaisthriving:socialmedia.TheybeginwithFacebookandextendthroughadizzyingarra
随机试题
单纯肋骨骨折,一般无须手法整复,是因为
《诗经》中收录诗歌的时间断限是【】
美学的哲学基础是马克思主义的()
在Excel工作表中,正确的Excel公式形式为()
关于晚期产后出血描述最正确的是:
A.硅胶柱色谱法B.聚酰胺色谱法C.膜分离法D.分馏法E.离子交换树脂法主要根据沸点高低分离物质的方法是()
下列各项属于个人健康保险续保条款内容的是( )。Ⅰ.保险人有权拒绝续保或者有权解除健康保险单的环境因素或条件Ⅱ.保险人增加健康保险单的保险费的权利Ⅲ.保险人不能增加健康保险单的保险费Ⅳ.可以有条件续保个人健康保险保单
由学生自己来提出问题,设计方案,实施并得出结论的课程,属于()。
发现行星运动定律的天文学家是()。
Aformertownhallworkermadelegalhistorylastweekwhenshewasawarded£67,000forstressbroughtonbyherwork.Theruling
最新回复
(
0
)