首页
登录
职称英语
The ocean bottom—a region nearly 2.5 times greater than the total land area
The ocean bottom—a region nearly 2.5 times greater than the total land area
游客
2023-12-27
12
管理
问题
The ocean bottom—a region nearly 2.5 times greater than the total land area of the Earth —is a vast frontier that even today is largely unexplored and uncharted. Until about a century ago, the deep-ocean floor was completely inaccessible, hidden beneath waters averaging over 3,600 meters deep. Totally without light and subjected to intense pressures hundreds of times greater than at the Earth’s surface, the deep-ocean bottom is a hostile environment to humans, in some ways as forbidding and remote as the void of outer space.
Although researchers have taken samples of deep-ocean rocks and sediments for over a century, the first detailed global investigation of the ocean bottom did not actually start until 1968, with the beginning of the National Science Foundation’s Deep Sea Drilling Project (DSDP). Using techniques first developed for the offshore oil and gas industry, the DSDP’s drill ship, the Glomar Challenger, was able to maintain a steady position on the ocean’s surface and drill in very deep waters, extracting samples of sediments and rock from the ocean floor.
The Glomar Challenger completed 96 voyages in a 15-year research program that ended in November 1983. During this time, the vessel logged 600,000 kilometers and took almost 20,000 core samples of seabed sediments and rocks at 624 drilling sites around the world. The Glomar Challenger’s core samples have allowed geologists to reconstruct what the planet looked like hundreds of millions of years ago and to calculate what it will probably look like millions of years in the future. Today, largely on the strength of evidence gathered during the Glomar Challenger’s voyages, nearly all earth scientists agree on the theories of plate tectonics and continental drift that explain many of the geological processes that shape the Earth.
The cores of sediment drilled by the Glomar Challenger have also yielded information critical to understanding the world’s past climates. Deep-ocean sediments provide a climatic record stretching back hundreds of millions of years, because they are largely isolated from the mechanical erosion and the intense chemical and biological activity that rapidly destroy much land-based evidence of past climates. This record has already provided insights into the patterns and causes of past climatic change—information that may be used to predict future climates. [br] The word "strength" underlined in Paragraph 3 is closest in meaning to______.
选项
A、basis
B、purpose
C、discovery
D、endurance
答案
A
解析
词义题型。 on the strength of在……基础上;on the basis of在……基础上。
转载请注明原文地址:https://tihaiku.com/zcyy/3310743.html
相关试题推荐
Howmanyregionsareinvolvedintheinternationalstudy?[br][originaltext]
Howmanyregionsareinvolvedintheinternationalstudy?[br][originaltext]
Howmanyregionsareinvolvedintheinternationalstudy?[originaltext]Does
WhydidRegionalismbecomesopopularintheU.S.duringtheGreatDepression?A、
ArecentstudybyOxfordUniversityestimatesthatnearlyhalfofalljobsin
这种“自下而上”式的改革方式,力求进一步理顺中央和地方的金融管辖权,有效缓解中小企业融资难。This"bottomtotop"approachtof
Attemptshavebeenmadefornearlythreedecadestoincreasetheamountofpreci
Foralongtimeinthatvastregion,thislawwasinabeyance.A、activeuseB、dou
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
随机试题
TheWhiteHouse,growingconcernedthattheCongressionaltimetablefor
[originaltext]AnewprogramcalledAdelanTECHLeadershipishelpingstuden
[originaltext]M:I’mgoingtotalktoyounowaboutthesuffragettemovement.W
生活特征是纷繁的,确定主要特征并改变它与其他诸特征之间的关系,不完全以事物本身为
发生在皮脂溢出部位的慢性炎症性疾病,称为A.皮脂腺囊肿 B.热疮 C.油风
A.全蝎 B.代赭石 C.天麻 D.蜈蚣 E.钩藤入汤剂宜先剪的药物是
路基防护工程的类型可分为( )。 A、边坡坡面防护 B、冲刷防护 C
(2015年5月)在劳动关系的调整方式中,()的基本特点是体现劳动关系当事人
某女,38岁。乳房肿块,质韧不坚,胀痛,症状常随喜怒消长,伴胸闷胁胀,善郁易怒,
北方某省级经济开发区设立于2016年,正在编制规划环评文件,开发区规划面积为34
最新回复
(
0
)