首页
登录
职称英语
The ocean bottom — a region nearly 2. 5 times greater than the total land ar
The ocean bottom — a region nearly 2. 5 times greater than the total land ar
游客
2025-01-21
24
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] Which of the following is true of the Glomar Challenger?
选项
A、It is a type of submarine.
B、It is an ongoing project.
C、It has gone on over 100 voyages.
D、It made its first DSDP voyage in 1968.
答案
D
解析
是非题型。第二段中的the Glomar Challenger做the DSDP’s drill ship的同位语,因而排除A,B项。根据第三段第一句The Glomar Challenger completed 96 voyages…可排除C项。
转载请注明原文地址:https://tihaiku.com/zcyy/3922697.html
相关试题推荐
Foralongtimeinthatvastregion,thislawwasinabeyance.A、activeuseB、dou
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
随机试题
OnehundredandthirteenmillionAmericanshaveatleastonebank(36)______
A)Whatmakesabusinessideagood?Haveyoueverthoughtyouhadagreatid
[originaltext]W:Shouldn’tsomeonepickuptheclothesfromthecleaner’s?M:D
Youshouldspendabout20minutesonQuestions14-26,whicharebasedonReading
Tom:Whatwasyourworstsubject?Ron:Mm...thatwouldbechemistry.Ineverc
[audioFiles]audio_eusm_0116(20106)[/audioFiles]A、Itcan’tbecompressed.B、It’s
欲开发一系统,如果客户不能完整描述需求,则开发过程最适宜采用______。A.原
以下不属于利率风险的是()。A.重新定价风险 B.利率结构性风险 C.期权
下列肝炎病毒基因组归类于DNA病毒的是A:甲型肝炎 B:乙型肝炎 C:丙型肝
机体内环境的稳态是指 A.细胞内液理化性质保持不变B.细胞外液理化性质保持不
最新回复
(
0
)