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
2025-01-23
8
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 NOT mentioned in the passage as being a result of the Deep Sea Drilling Project?
选项
A、Geologists were able to determine the Earth’s appearance hundreds of millions of years ago.
B、Two geological theories became more widely accepted.
C、Information was revealed about the Earth’s past climatic changes.
D、Geologists observed forms of marine life never before seen.
答案
D
解析
根据第三段第三句The Glomar Challenger’s core samples have allowed geologists to reconstruct what the planet looked like hundreds of millions of years ago...和最后一句...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.及第四段,可知A、B、C三项正确。选项D在文中未提到。
转载请注明原文地址:https://tihaiku.com/zcyy/3926001.html
相关试题推荐
InthisrapidlygrowingEastAsianregion,weareexpectingtosee25millionmo
我们呼吁发达国家加快技术转让、扩大市场准入、减少贸易壁垒。Wecallforgreatercommitmentandactionsonthep
TheregionaroundtheBelgiancityofWaterlooisbusilypreparingtocommemo
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
ArecentstudybyOxfordUniversityestimatesthatnearlyhalfofalljobsi
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
随机试题
Theauthorcitestheexampleofthe16-year-oldAlbanianhigh-schooldrop-outto
Forthispart,youareallowed30minutestowriteacompositiononthetopicMy
为什么说以公有制为主体、多种所有制经济共同发展,是我国社会主义初级阶段的一项基本
左心房扩大的早期X线征象是()A.左前斜位左主支气管受压抬高 B.后前位左心缘
冰雪天气时,检查设备积雪、覆冰厚度情况,及时清除构架上形成的冰柱。
关于福费廷业务的特点,下列说法正确的有()。A:属于中期融资业务 B:适合于1
下列计量单位中,属于建筑施工单位产品人工时间定额的单位是( )。A.小时 B
(2017年真题)下列安全出口的检查结果中,符合现行国家消防技术标准的有(
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
不宜采用强夯法施工的是()。A.高饱和度的粉土 B.碎石土 C.杂填土 D
最新回复
(
0
)