托福 新托福 35 - Earth's Age
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9.Look at the four squares [█]that indicate where the following sentence could be added to the passage.Where would the sentence best fit? Click on a square [] to insert the sentence in the passage.
This idea came to be known as the principle of uniformitarianism, and Herodotus was only the first to apply it..
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One of the first recorded observers to surmise a long age for Earth was the Greek historian Herodotus, who lived from approximately 480 B.C. to 425 B.C. He observed that the Nile River Delta was in fact a series of sediment deposits built up in successive floods. By noting that individual floods deposit only thin layers of sediment, he was able to conclude that the Nile Delta had taken many thousands of years to build up. More important than the amount of time Herodotus computed, which turns out to be trivial compared with the age of Earth, was the notion that one could estimate ages of geologic features by determining rates of the processes responsible for such features, and then assuming the rates to be roughly constant over time. Similar applications of this concept were to be used again and again in later centuries to estimate the ages of rock formations and, in particular, of layers of sediment that had compacted and cemented to form sedimentary rocks.

It was not until the seventeenth century that attempts were made again to understand clues to Earth's history through the rock record. Nicolaus Steno (1638-1686) was the first to work out principles of the progressive depositing of sediment in Tuscany. However, James Hutton (1726-1797), known as the founder of modern geology, was the first to have the important insight that geologic processes are cyclic in nature. Forces associated with subterranean heat cause land to be uplifted into plateaus and mountain ranges. The effects of wind and water then break down the masses of uplifted rock, producing sediment that is transported by water downward to ultimately form layers in lakes, seashores, or even oceans. Over time, the layers become sedimentary rock. These rocks are then uplifted sometime in the future to form new mountain ranges, which exhibit the sedimentary layers (and the remains of life within those layers) of the earlier episodes of erosion and deposition.

Hutton's concept represented a remarkable insight because it unified many individual phenomena and observations into a conceptual picture of Earth’s history. With the further assumption that these geologic processes were generally no more or less vigorous than they are today, Hutton's examination of sedimentary layers led him to realize that Earth's history must be enormous, that geologic time is an abyss and human history a speck by comparison.

After Hutton, geologists tried to determine rates of sedimentation so as to estimate the age of Earth from the total length of the sedimentary or stratigraphic record. Typical numbers produced at the turn of the twentieth century were 100 million to 400 million years. These underestimated the actual age by factors of 10 to 50 because much of the sedimentary record is missing in various locations and because there is a long rock sequence that is older than half a billion years that is far less well defined in terms of fossils and less well preserved.

Various other techniques to estimate Earth's age fell short, and particularly noteworthy in this regard were flawed determinations of the Sun's age. It had been recognized by the German philosopher Immanuel Kant (1724-1804) that chemical reactions could not supply the tremendous amount of energy flowing from the Sun for more than about a millennium. Two physicists during the nineteenth century both came up with ages for the Sun based on the Sun's energy coming from gravitational contraction. Under the force of gravity, the compression resulting from a collapse of the object must release energy. Ages for Earth were derived that were in the tens of millions of years, much less than the geologic estimates of the lime.

It was the discovery of radioactivity at the end of the nineteenth century that opened the door to determining both the Sun’s energy source and the age of Earth. From the initial work came a suite of discoveries leading to radio isotopic dating, which quickly ted to the realization that Earth must be billions of years old, and to the discovery of nuclear fusion as an energy source capable of sustaining the Sun's luminosity for that amount of time. By the 1960s, both analysis of meteorites and refinements of solar evolution models converged on an age for the solar system, and hence for Earth, of 4 5 billion years.

第一批记录在册的、推测出地球拥有长长历史的观察者之一是希腊的历史学家希罗多德。他大致出生于公元前480年,去世于公元前425年。他观察到,尼罗河三角洲实际上是由连续不断的水流流经时逐渐沉积下来的沉积物组成的。希罗多德还注意到,单独的水流只能带来薄薄的一层沉积物,他因此得出结论:尼罗河三角洲是经过成千上万年才沉积而成的。比希罗多德计算的时间长短更重要的是,他引入了一个概念:假设一个地质特征形成的速率在历史上是相对稳定的,我们可以通过计算形成相应地质特征过程的速率来估计其年龄。在这个概念面前,地球的年龄到底是多大实在是不重要了。在以后的几个世纪里,这个概念被多次应用于计算岩石形成的年龄,尤其是在形成沉积岩层时一层层压紧的各种沉积层的年龄。 直到17世纪,人类才再次试图去通过岩石记录来了解可以算出地球历史的线索。Nicolaus Steno(1638-1686)是首位推算出托斯卡纳区(意大利行政区)沉积过程的演变规则的人。然而,现代地质学的创始人James Hotton(1726-1797)才是第一位发现这个重要事实的人:地质过程在自然界其实是循环往复的。与地下热量有关的力使得土地被抬升成高原和山脉。接着,风力和水流的作用分解了大块的凸起的岩石,产生了随水流向下游流去的沉积物。这些沉积物最终形成了湖里、海岸上或者海洋里的沉积层。随着时间的流逝,这些沉积层变成了沉积岩。 Hutton的概念展示给我们一个重要的想法,因为它将很多单独的地质现象和观察整合成了一个地球历史的概念图。如果我们可假定这些地质过程过去的活跃程度和现在的活跃程度所差无几的话,Hutton对于沉积层的研究会让他意识到,地球的历史会是非常漫长的,人类的历史之于地球的历史,就如同灰尘之于深渊,是微不足道的。 在Hutton之后,地质学家试图确定沉积过程的速率,因为他们想通过沉积记录或者地层记录的整体长度来估计地球的年龄。在20世纪,地质学家估计的地球年龄一般是在10亿年到40亿年间。但是这个数字实际上低估了10%到50%地球的年龄,原因有二:一是很多沉积记录在很多地点已经找不到了;二是存在一种长的岩石序列,这种序列比5亿年还要古老,而这种岩石序列在化石方面并没有很好地被定义,或者没有被很好地保存到现在。 还有各式各样的估算地球年龄的技术,但普遍都会低估地球的年龄,在这方面值得注意的是人类对于太阳年龄的不完美计算。德国哲学家康德认为,化学反应并不足以支撑太阳在千年里放射出来的巨大能量。 在19世纪,两个物理学家基于太阳能量来源于引力收缩这个原理算出了太阳的年龄。在重力作用下,这种来源于物体碰撞的引力收缩一定会释放能量。地球的年龄也因此被推测出来,大约是几千万年,这个数值比通过石灰岩的地质演变过程推测出来的数值要小很多。在19世纪末尾,对于放射现象的发现打开了计算太阳能量来源和地球年龄的大门。基于最初的研究工作,人类发现了放射性同位素追溯时间的办法。这种方法很快让人类意识到,地球肯定有几十亿年之久,以及核融合可以为太阳长时间的发光持续供能。

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最新提问
  • wx_6697
    觉得B C 意思一样,不知道选哪个
  • wx_5576
    这道题C为什么对,E为什么不对?
  • wx_5576
    B为什么不能选啊?
  • wx_6697
    TPO30 passage 2 Q5我选的 D,不明白为啥不对?
  • wx_6697
    鑫哥,TPO6passage3Q5 答案是给错了吗?好多人都选A
  • wx_6697
    这题也很容易选错选成了D
  • wx_6697
    这道题A为什么错了
  • 芊儿
    为什么这道题不选c??a中的variety不是应该对应文中的differentiating 吗??求解!
  • wx_1000
    这道题不选E是因为太细节了吗
  • 王金阁
    这个题为什么不选C啊。。。
  • 芊儿
    这道题的D选项不是和文中的better able to reproduce in open settings相对应么??
  • 风荨火
    有大佬解释一下这个为啥选D嘛?
  • 以沫
    请问这个D 在哪里提现?为什么D错?
  • 芊儿
    第六题 的C选择为什么不对,感觉A是明显驳斥啊...
  • wx_6697
    鑫哥,这道题D是从哪里看出来的
  • wx_6697
    这题选的A,根据是Joly’s calculations clearly supported those geologists who insisted on an age for Earth far in excess of a few million years.想问鑫哥为啥不选A
  • wx_6697
    这题我选的是C依据是into a new habitat outside of its natural range, it may adapt to the new environment and leave its enemies behind.C为啥错了呢?鑫哥
  • wx_8861
    F选项的weather-related destruction在哪里体现了呢?原文最后一段的开头Among the costs里的costs是不是打错了?应该是coast?
  • wx_6697
    求问这道题B为啥不选,原文依据:viable seeds of pioneer species can be found in large numbers on some forest floors.
  • 与托福的斗争史
    与托福的斗争史 去解答 去解答
    这题为什么选C?
  • 小雨淅沥哗啦的下
    小雨淅沥哗啦的下 去解答 去解答
    B哪里错了
  • 小雨淅沥哗啦的下
    小雨淅沥哗啦的下 去解答 去解答
    B为啥不对
  • 李浩然
    B选项错误,是因为残缺么?
  • wx_100
    请问在做题的时候如何排除c呢。看了答案,感觉是该选a的,但是当时做题脑子一热,就特别钟爱c,也没看其他选项。。求敲醒。。
  • wx xxxxx
    请问鑫哥,这段开头有写As one pesticide replaces another为什么不是对应a new pesticide is developed?
  • wx_7695
    鑫哥,从哪里看出来这个masks 不是use呀,原文说了wear呀
  • haiyuqiao
    @鑫哥,这题the damage will continue 不应该对应前面的 the target species evolves resistance to it,然后As one pesticide replaces another,不应该是结束了time cycle 吗
  • wx_2065
    鑫哥,想知道E错在哪里?
  • wx_7695
    鑫哥,B选项 cannot extended to earlier geological periods. 原文说的意思是后来的进化无法估计吧
  • wx_2163
    B为什么不选
  • wx_7780
    鑫哥,这个哪里看不use了。BD是修饰错,C是无中生有,怎么能直接选出A?
  • 100
    看到第一句话,以为是中心句就选了A... 为什么不能选A呢
  • 100
    为什么选b?
  • gu33
    请问下 这里选D的原因是 因为 evolutionary approach 对应着 原文的 Rates of evolution 嘛? 这里我选了C。。不是很懂 插入句和 D的关系 求解答
  • 我是啦啦啦
    我是啦啦啦 去解答 去解答
    这个题A哪里错了?是因为主语不对吗?这个C比A多一步推理啊
  • haiyuqiao
    鑫哥,D选项里的19世纪出现了很多假设,原文中并没有提到啊
  • wx_7060
    为什么选a 呢。我觉得a是细节。F哪错了?
  • wx_1105
    我想问一下,这道题为什么不能选A呢?
  • wx_8122
    D为什么不选
  • wx_1655
    f选项哪里说了
  • chaulaw
    鑫哥,原文是below经济损害水平,D是一触发经济损害就用,这也对吗?
  • chaulaw
    interclan婚姻是对的吗?不是只在自己的family结婚扩大家族吗?
  • wx_6697
    鑫哥,这道题答案是不是错了,好多人选D 我也选的D求解答
  • wx_6697
    这道题应该是一道易错题,每个选项的都有,然而我选的A错了,求解
  • wx_6697
    鑫哥,这题的C是怎么得到的?B也没有找到啊?难道不是应该选B
  • wx_6697
    鑫哥,还有这个,好多人选A答案是不是错了
  • wx_6697
    求问D是从哪里得出来的,我选的B呀哎呀
  • wx_4185
    it is difficult to say how far they were intended to be portraits rather than generalized images 这句话怎么理解呢
  • 此楠楠
    请问下这个插入题怎么选的呢?
  • 此楠楠
    求鑫哥讲解下A选项。。。 Even though in error, Joly’s calculations clearly supported those geologists who insisted on an age for Earth far in excess of a few million years.