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
考研
Scattered around the globe are more than one hundred regions of volcanic activity known as hot spots. Unlike most volcanoes, hot
Scattered around the globe are more than one hundred regions of volcanic activity known as hot spots. Unlike most volcanoes, hot
admin
2019-06-20
59
问题
Scattered around the globe are more than one hundred regions of volcanic activity known as hot spots. Unlike most volcanoes, hot spots are rarely found along the boundaries of the continental and oceanic plates that comprise the Earth’s crust; most hot spots lie deep in the interior of plates and are anchored deep in the layers of the Earth’s surface. Hot spots are also distinguished from other volcanoes by their lavas, which contain greater amounts of alkali metals than do those from volcanoes at plate margins.
In some cases, plates moving past hot spots have left trails of extinct volcanoes in much the same way that wind passing over a chimney carries off puffs of smoke. It appears that the Hawaiian Islands were created in such a manner by a single source of lava, welling up from a hot spot, over which the Pacific Ocean plate passed on a course roughly from the east toward the northwest, carrying off a line of volcanoes of increasing age. Two other Pacific island chains—-the Austral Ridge and the Tuamotu Ridge—parallel the configuration of the Hawaiian chain; they are also aligned from the east toward the northwest, with the most recent volcanic activity near their eastern terminuses.
That the Pacific plate and the other plates are moving is now beyond dispute; the relative motion of the plates has been reconstructed in detail. However, the relative motion of the plates with respect to the Earth’s interior cannot be determined easily. Hot spots provide the measuring instruments for resolving the question of whether two continental plates are moving in opposite directions or whether one is stationary and the other is drifting away from it. The most compelling evidence that a continental plate is stationary is that, at some hot spots, lavas of several ages are superposed instead of being spread out in chronological sequence. Of course, reconstruction of plate motion from the tracks of hot-spot volcanoes assumes that hot spots are immobile, or nearly so. Several studies support such an assumption, including one that has shown that prominent hot spots throughout the world seem not to have moved during the past ten million years.
Beyond acting as frames of reference, hot spots apparently influence the geophysical processes that propel the plates across the globe. When a continental plate comes to rest over a hot spot, material welling up from deeper layers forms a broad dome that, as it grows, develops deep fissures. In some instances, the continental plate may rupture entirely along some of the fissures so that the hot spot initiates the formation of a new ocean. Thus, just as earlier theories have explained the mobility of the continental plates, so hot-spot activity may suggest a theory to explain their mutability.
The author’s style can best be described as______.
选项
A、dramatic
B、archaic
C、esoteric
D、objective
答案
D
解析
事实细节题。本文为科技说明文,介绍了热点这一地质构造的特点以及其与板块移动之间的关系。文中主要是普及知识的说明性文字,并未有明显的个人论点,可见其行文风格是客观的,故答案为[D]项。
转载请注明原文地址:https://kaotiyun.com/show/BDra777K
本试题收录于:
翻译硕士(翻译硕士英语)题库专业硕士分类
0
翻译硕士(翻译硕士英语)
专业硕士
相关试题推荐
()isrenownedforitsuniqueplantandanimalspecies.Itisestimatedthattherearearound20,000to25,000different
Whenitwaspublishedin1959,RobertFrank’sbook,TheAmerican,______hostilityintheUnitedStates.
Afull-sizedtripodisfartoo______tocarryaround.Ifindthispocket-sizedoneismuchhandier.
It’snothingnewthatEnglishuseisontherisearoundtheworld,especiallyinbusinesscircles.ThisalsohappensinFrance,
Ironically,theproperuseoffigurativelanguagemustbebasedonthedenotativemeaningofthewords,becauseitisthefailur
BecausemodernscientistsfindtheancientGreekviewofthecosmosoutdatedandirrelevant,theynowperceiveitasonlyof___
ThescienceoflinguisticshashelpedtoreconstructthelongroadtheancestorsofmoderndayIndianstraveledinNorthAmerica
TheRomanlanguageservedasthefirstmodelforansweringthequestion.EventosomeonewithnoknowledgeofLatin,thesimilar
Since1813reactiontoJaneAusten’snovelshasoscillatedbetween______andcondescension;butingenerallaterwritershave
随机试题
Manypeoplewould【C1】______tolearnthattwentymillionAmericans【C2】______motorcycles.Fewpeoplerealizethatmotorcyclingis
A.便血B.上消化道出血C.自发性腹膜炎D.原发性肝癌E.肝性脑病肝硬化患者最常见的并发症是
使用保护具时,病人的肢体应处于
一辆油罐车在A省境内的高速公路上与一辆大客车追尾,引发油罐车爆燃,造成20人死亡。该油罐车中所载溶剂油是自B省发往C省某企业的货物。依据《生产安全事故报告和调查处理条例》的规定,负责该起事故调查的主体是()。
根据《合伙企业法》,申请设立合伙企业,应当向企业登记机关提交()等文件。Ⅰ.登记申请书Ⅱ.合伙协议书Ⅲ.合伙人身份证明Ⅳ.合伙企业法人授权书
混合成本分解的合同确认法要配合()。
A注册会计师负责对甲公司2011年度财务报表进行审计,在对应收账款实施控制测试时,A注册会计师决定采用统计抽样方法,注册会计师的观点如下:(1)在所有的控制测试过程中注册会计师均可采用审计抽样。(2)由于总体变异性较大,A注册会计师将总体分为三层。(3
若洪水来时躲避转移没有及时完成,被围困时导游应采取的自救措施包括()。
简要说明学习策略的教学模式。
简述国债市场的作用。
最新回复
(
0
)