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
2025-01-19
20
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 fight 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] Deep-ocean sediments provide better information about the world’s past climate because they ________.
选项
A、are well protected
B、have land-based evidence
C、are in isolation
D、have a longer history
答案
A
解析
本题考查事实细节。根据文章第四段第二句“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.”可知,深海沉积物提供了一个追溯到几亿年前的气候记录,因为他们在很大程度上远离机械侵蚀和强烈的化学和生物活性,而那些会快速摧毁过去气候的路基证据。由此可推出,答案是A。
转载请注明原文地址:https://tihaiku.com/zcyy/3919679.html
相关试题推荐
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
NearlyeveryoneinBritainwouldliketoowntheirownhomeand,whethertheydo
Fornearlyacentury,twoUnitedStatesgovernmentalagencies,theUnitedSt
Fornearlyacentury,twoUnitedStatesgovernmentalagencies,theUnitedSt
Fornearlyacentury,twoUnitedStatesgovernmentalagencies,theUnitedSt
随机试题
Manydaysseemtobring【B1】______tasksandresponsibilities,allofwhichap
Recently,AlexStenner,asophomoreattheUniversityofWisconsin-GreenBay
()是指攻击者发送虚假信息来欺骗其他用户。A.信息截取和窃取 B.信息篡改
叶女士,45岁,近日感到双腿关节疼痛,行走、提重物和在上楼时疼痛加剧。因多日未愈
口服制剂设计一般不要求A.药物在胃肠道内吸收良好 B.避免药物对胃肠道的刺激作
麻疹减毒活疫苗的初种月龄为A.2~3个月 B.4~5个月 C.6~7个月
已知图示斜面的倾角为θ,若要保持物块A静止,则物块与斜面之间的摩擦因数f所应满足
甲公司走私汽车获利人民币4000万元后,欲通过乙期货交易所的账户将该笔资金换成外
下列船舶适用《海商法》的是:()A.缉私船 B.军舰 C.移动式海上钻井平
患者男,15岁。阴囊内肿块,每日起床或站立后肿块缓慢增大,平卧位缩小。透光试验阳
最新回复
(
0
)