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
31
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 author mentions "outer space" underlined in Paragraph 1 because______.
选项
A、the Earth’ s climate millions of years ago was similar to conditions in outer space
B、it is similar to the ocean floor in being alien to the human environment
C、rock formations in outer space are similar to those found on the ocean floor
D、techniques used by scientists to explore outer space were similar to those used in ocean exploration
答案
B
解析
推断题型。 从第一段最后一句中的…in some ways as forbidding and remote as the void of outer space.可以推断出答案是B项。
转载请注明原文地址:https://tihaiku.com/zcyy/3310739.html
相关试题推荐
AccordingtoUNICEF,around564millionIndians,nearlyhalfthepopulation,
AccordingtoUNICEF,around564millionIndians,nearlyhalfthepopulation,
AccordingtoUNICEF,around564millionIndians,nearlyhalfthepopulation,
AccordingtoUNICEF,around564millionIndians,nearlyhalfthepopulation,
AccordingtoUNICEF,around564millionIndians,nearlyhalfthepopulation,
AccordingtoUNICEF,around564millionIndians,nearlyhalfthepopulation,
Thelinguistdiscoveredstrikingsimilaritiesbetweenanearly_____languages
Insuranceisthesharingof【C1】________Nearlyeveryoneisexposed【C2】_______
Insuranceisthesharingof【C1】________Nearlyeveryoneisexposed【C2】_______
Insuranceisthesharingof【C1】________Nearlyeveryoneisexposed【C2】_______
随机试题
Manyrapecrisisandbatteredwomen’sprogramsalsohaveeducationalcomponents
In1915EinsteinmadeatriptoGottingentogivesomelecturesattheinvit
下列各项中,属于我国《物权法》规定的担保物权的是( )。A.典权 B.地役权
2岁小儿,咳嗽、咳痰、咽部红肿,查体:T38.5℃。心肺听诊无异常。 下列
直疝三角的三边是A.腹壁下动脉、联合腱和腹股沟韧带 B.联合腱、腹直肌外缘和耻
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
中国证券监督管理委员会及其派出机构依法对期货公司及其分支机构实行监督管理。()
颞深间隙感染临床表现为A.张口受限,咀嚼时痛,口内上颌结节后方有压痛B.张口受限
根据《水污染防治行动计划》,全力保障水生态环境安全主要包括( )。A.保障饮用
男,60岁。2年来出现间歇性无痛性全程肉眼血尿,终末加重,近半年来出现尿频、尿痛
最新回复
(
0
)