GRE写作素材之陨石撞击和恐龙的灭绝
恐龙灭绝的其它原因写一篇小短文阐述作文
恐龙灭绝的其它原因写一篇小短文阐述作文One of the most intriguing and widely debated topics in the field of paleontology is the extinction of dinosaurs. While it is commonly believed that an asteroid impact was the primary cause of their demise, there are alternative theories that propose other factors played a significant role as well.一个常见而备受争议的古生物学问题是恐龙的灭绝。
尽管人们普遍认为，一颗陨石撞击地球是其主要原因，但有其他理论也提出了其他因素在其中起到了重要作用。
One such theory suggests that volcanic activity could have been a contributing factor to the extinction event. During the late Cretaceous period, immense volcanic eruptions occurred in what is now known as the Deccan Traps in India. These eruptions released massive amounts of greenhouse gases into the atmosphere, leading to global climate change and environmental disturbances.有一种理论认为，火山活动可能是灭绝事件的一个因素。
在晚白垩纪时期，印度的德干岩石区发生了巨大的火山喷发。
恐龙怎样消失了英文作文
恐龙怎样消失了英文作文英文：How did dinosaurs disappear? This question has puzzled scientists for years. There are several theories that attempt to explain the extinction of these ancient creatures.One theory is that a massive asteroid impact caused a chain reaction that ultimately led to the extinction of dinosaurs. This theory is supported by the discovery of a large impact crater in Mexico that dates back to the time of the extinction. The impact would have caused widespread destruction and a global climate change that made it difficult for dinosaurs to survive.Another theory suggests that a series of volcanic eruptions caused the extinction. These eruptions would have released large amounts of sulfur dioxide into the atmosphere, which would have caused a cooling effect on theplanet. This theory is supported by the discovery of volcanic activity in the Deccan Traps in India that coincides with the time of the extinction.Finally, some scientists believe that a combination of factors led to the extinction of dinosaurs. These factors include climate change, disease, and competition from other species.Regardless of which theory is correct, it is clear that the extinction of dinosaurs was a complex event that involved many different factors. It is also important to note that while dinosaurs are no longer around, their legacy lives on in the form of birds, which are believed to have evolved from dinosaurs.中文：恐龙是如何消失的？这个问题困扰着科学家多年。
关于恐龙灭绝的原因作文
关于恐龙灭绝的原因作文英文回答：Dinosaurs, the magnificent creatures that once roamed the Earth, met a tragic end millions of years ago. Scientists have been studying the causes of theirextinction for decades, and while there is still some debate, there are several widely accepted theories.One of the most popular theories is the impact of a massive asteroid or comet. This catastrophic event, known as the Chicxulub impact, occurred around 66 million years ago. The impact released an enormous amount of energy, causing widespread fires, tsunamis, and a cloud of dust and debris that blocked out the sun. This resulted in a significant drop in temperature and disrupted the food chain, ultimately leading to the extinction of dinosaurs.Another theory suggests that volcanic activity played a role in the demise of dinosaurs. During the Late Cretaceousperiod, there were several large volcanic eruptions, releasing massive amounts of lava, ash, and toxic gasesinto the atmosphere. These volcanic emissions could have caused global climate change, leading to the extinction of dinosaurs.Additionally, changes in sea level and climate could have contributed to the extinction of dinosaurs. TheEarth's climate was undergoing significant changes during the Late Cretaceous period, with fluctuating sea levels and changing weather patterns. These changes could have disrupted the habitats and food sources of dinosaurs, making it difficult for them to survive.Furthermore, competition and predation by other species may have played a role in the decline of dinosaurs. As new species evolved and diversified, they could have outcompeted dinosaurs for resources and prey. The rise of mammals, for example, may have led to increased predation on dinosaur eggs and young, further reducing their population.In conclusion, the extinction of dinosaurs was likely a result of a combination of factors, including the impact of a massive asteroid or comet, volcanic activity, changes in sea level and climate, and competition from other species. While the exact sequence of events and their relative importance are still subject to ongoing research, these theories provide valuable insights into the downfall of these magnificent creatures.中文回答：恐龙，曾经在地球上徜徉的壮丽生物，数百万年前遭遇了悲惨的结局。
恐龙灭绝原因
恐龙灭绝原因恐龙灭绝是地球历史上最为重要和引人注目的事件之一。
恐龙是地球上最为壮观和庞大的动物物种之一，但在约6500万年前，他们突然消失了。
多年来，科学家们一直在努力研究恐龙灭绝的原因。
虽然还没有完全确定，但目前有三种主要的理论被广泛接受，分别是陨石撞击理论、火山活动理论和气候变化理论。
陨石撞击理论是最为广为接受的恐龙灭绝原因之一。
根据这个理论，一颗直径约10公里的陨石巨大撞击了地球，形成了今天墨西哥湾的一个巨大的撞击坑，称为吉百利坑。
这场巨大的灾难引起了全球性的火山爆发、地震和大规模的火灾，导致地球上的生物圈遭受了巨大的破坏。
这种大规模的环境变化将使原本占据食物链顶端的恐龙遭受到严重的挑战，最终导致它们的灭绝。
第二个理论是火山活动理论。
大约6500万年前，地球上的一个大规模火山喷发事件发生在现在的印度地区，形成了德干特拉普花岗岩地区。
这次喷发释放了大量的二氧化硫和二氧化碳等气体，使大气中的温室效应迅速增强。
这种气候变化可能导致了恐龙灭绝，因为恐龙对气候变化相对敏感。
最后一个理论是气候变化理论。
科学家们发现，恐龙灭绝发生在白垩纪晚期到古近纪早期，这个时期被称为白垩纪-古近纪灭绝事件（K-T事件）。
在这期间，地球经历了巨大的气候变化，可能由于多种因素的复杂相互作用而引起。
其中一种可能的原因是海洋水温的剧烈变化，这导致了厄尔尼诺事件和海洋生态系统的严重变化。
这种变化可能影响了恐龙的食物链和生存环境，从而导致它们的灭绝。
尽管以上三个理论都有其合理性和证据支持，但没有一个单一的因素可以完全解释恐龙灭绝事件。
相反，科学家们普遍认为，这些因素可能相互作用，并在相对较短的时间内导致了恐龙的灭绝。
此外，还有一些次要的理论被提出，例如疾病和基因突变。
然而，这些理论得到的支持相对较少，尚未得到充分证实。
为了更好地理解恐龙灭绝的原因，科学家们在全球范围内进行了大量的研究和发现。
例如，他们在墨西哥的吉百利坑中发现了与陨石撞击相关的证据，包括钻井样本和特殊的岩石层。
恐龙灭绝的原因英语作文
恐龙灭绝的原因英语作文英文回答：The extinction of the dinosaurs, an iconic and enigmatic event in Earth's history, has been the subject of extensive scientific inquiry and debate. While the prevailing theory attributes the extinction primarily to a massive asteroid impact, several other factors have been identified as potential contributing causes.Asteroid Impact:The leading hypothesis suggests that a giant asteroid, approximately 10 kilometers in diameter, struck the Earth near the present-day Chicxulub Peninsula in Mexico around 66 million years ago. The impact released immense energy, creating a crater 180 kilometers wide and triggering a series of devastating effects. It is believed that the impact sent debris and dust particles into the atmosphere, blocking sunlight and causing global cooling. Thesubsequent climate change, combined with the wildfires ignited by the impact, may have devastated plant and animal populations worldwide.Volcanic Eruptions:Another theory posits that massive volcanic eruptions played a significant role in the extinction. The Deccan Traps in India, one of the largest volcanic provinces on Earth, erupted over several million years prior to the asteroid impact. These eruptions released vast amounts of sulfur dioxide and other gases into the atmosphere, which may have depleted the ozone layer, exposing Earth's surface to harmful solar radiation. The ensuing climate change and acid rain could have further exacerbated the crisis for dinosaurs.Climate Change:Long-term climate change may have also contributed to the dinosaurs' demise. The Earth was experiencing a gradual cooling trend during the late Cretaceous period, which mayhave disrupted habitats and food availability for certain dinosaur species. Additionally, fluctuations in sea levels could have inundated coastal regions, reducing nesting grounds for marine reptiles and other dinosaurs.Disease:Some scientists speculate that disease outbreaks may have played a role in the dinosaur extinction. The discovery of dinosaur fossils with pathological lesions suggests that diseases may have weakened populations and made them more vulnerable to other environmental stressors. However, concrete evidence linking specific diseases to the extinction event is still lacking.Competition and Predation:Competition with newly evolving mammals and birds may have also contributed to the dinosaurs' decline. Mammals, known for their adaptability and rapid reproduction, may have outcompeted dinosaurs for resources such as food and nesting sites. Additionally, the rise of tyrannosaurids andother predatory dinosaurs may have put pressure on populations of smaller herbivorous dinosaurs.中文回答：恐龙灭绝的原因：恐龙的灭绝是一个标志性的、神秘的地球历史事件，一直是广泛的科学调查和争论的主题。
恐龙灭绝的故事
恐龙灭绝的故事恐龙灭绝是地球上一个古老而又神秘的事件，迄今为止，科学家们对恐龙灭绝的原因仍然存在争议。
然而，通过对化石记录和地质学证据的研究，人们已经得出了一些可能的原因。
在过去的几十年里，科学家们提出了许多关于恐龙灭绝的假说，包括陨石撞击、火山喷发、气候变化等。
然而，这些假说中，最为广泛接受的是陨石撞击假说。
大约6,500万年前，地球上发生了一次巨大的陨石撞击事件，这一事件被认为是导致恐龙灭绝的主要原因之一。
科学家们在墨西哥尤卡坦半岛发现了一处巨大的陨石坑，这一发现为陨石撞击假说提供了有力的证据。
据研究人员推测，这次陨石撞击释放了大量的能量，导致了全球范围内的气候变化和生态系统崩溃。
陨石撞击导致了大量的灰尘和气溶胶进入大气层，遮蔽了阳光，使得地球的气温急剧下降。
这种气温的变化对于恐龙来说是致命的，它们无法适应这种极端的环境。
此外，陨石撞击还引发了大规模的火山喷发，释放了大量的二氧化硫和二氧化碳，加剧了全球气候的变化。
除了陨石撞击外，火山喷发也被认为是导致恐龙灭绝的重要原因之一。
在恐龙灭绝之前，地球上的火山活动异常频繁，释放了大量的火山灰和有毒气体，对地球的生态系统造成了严重的破坏。
这些有毒气体和火山灰污染了大气和水域，导致了许多生物的死亡。
此外，气候变化也对恐龙的生存产生了重大影响。
在恐龙灭绝之前，地球的气候发生了剧烈的变化，大规模的干旱和寒冷使得许多植物和动物无法生存下去。
恐龙们失去了它们的食物来源，生存环境变得极端恶劣，最终导致了它们的灭绝。
总的来说，恐龙灭绝是一个复杂而又神秘的事件，它可能是多种因素共同作用的结果。
陨石撞击、火山喷发和气候变化等因素相互交织，最终导致了恐龙的灭绝。
尽管我们对恐龙灭绝的原因尚未完全了解，但通过对化石记录和地质学证据的研究，我们可以更加深入地理解这一古老而又神秘的事件。
希望未来科学家们能够继续努力，揭开恐龙灭绝的更多秘密。
恐龙灭绝英文作文
恐龙灭绝英文作文英文：The extinction of dinosaurs has been a topic of great interest and debate for many years. There are several theories that attempt to explain why these magnificent creatures disappeared from the face of the earth. One theory is that a massive asteroid impact caused a chain reaction of events that eventually led to the extinction of the dinosaurs. Another theory suggests that volcanicactivity was the cause of their demise.Personally, I believe that a combination of factors led to the extinction of the dinosaurs. While the asteroid impact and volcanic activity may have played a role, Ithink that climate change was the primary cause. It is believed that the earth's climate was changing rapidly during the time of the dinosaurs, and this may have made it difficult for them to adapt and survive.There are also other factors that may have contributed to their extinction, such as disease and competition from other species. For example, the emergence of mammals may have played a role in the decline of the dinosaurs, as they were able to adapt more easily to changing environments.In conclusion, while there is no one definitive answer to the question of why the dinosaurs went extinct, I believe that a combination of factors, including climate change, asteroid impacts, volcanic activity, disease, and competition from other species, all played a role in their demise.中文：恐龙灭绝一直以来都是一个备受关注和争议的话题。
恐龙灭绝的原因与推断
恐龙灭绝的原因与推断恐龙灭绝是地球上一个古老而神秘的事件，已经持续了数百万年，让科学家们对其原因进行了长期的推断和研究。
在这篇文章中，我们将探讨恐龙灭绝的可能原因，并基于现有的科学证据做出推断。
第一部分：恐龙灭绝事件的背景恐龙是地球上曾经统治过的生物群中最为众多和著名的一类，其存在时间跨度达数千万年之久。
然而，突如其来的灭绝事件彻底改变了地球生物格局，使得恐龙永远地退出了地球的舞台。
第二部分：恐龙灭绝的可能原因1. 陨石撞击说有一种理论认为，恐龙灭绝可能是由一颗巨大的陨石撞击地球引起的。
这一说法的支持者指出，在墨西哥尤卡坦半岛附近发现了一处巨大的陨石坑，被认为是6500万年前陨石撞击引发恐龙灭绝事件的遗留证据。
2. 火山喷发说另一种理论认为，火山活动可能是导致恐龙灭绝的原因之一。
据称，当时地球上存在大规模火山活动，喷发出大量火山灰和有毒气体，对全球气候和生态系统造成了严重影响，最终导致了恐龙的灭绝。
3. 气候变化说还有一种理论认为，气候变化是导致恐龙灭绝的重要原因。
据研究表明，当时地球上气候剧烈变化，可能是由多种因素共同作用引起的，如火山喷发、陨石撞击等，造成了生态系统崩溃，进而导致了恐龙等物种的大规模灭绝。
第三部分：基于现有证据的推断通过对以上三种可能原因进行分析比较，我们可以得出如下推断：第一，陨石撞击说虽然具有较强的证据支持，但并不能完全解释恐龙灭绝事件发生前后出现了多种生物群落崩溃以及气候急剧变化的现象；第二，火山喷发说能够解释气候变化及部分生态系统崩溃现象，但单一原因难以导致整个地球生态系统的彻底崩溃；第三，气候变化说能够较好解释全球性气候剧烈变化现象，并可以与其他原因相互作用解释多样性崩溃。
基于上述分析，我们可以推断恐龙灭绝事件是由多种因素共同作用所导致的结果。
这也提醒我们在当前环境问题日益严峻的背景下，需要高度关注全球气候变化、生物多样性和环境保护等议题，共同努力保护我们共同的家园——地球。
恐龙灭绝的英文作文
恐龙灭绝的英文作文英文：The extinction of dinosaurs has been a mystery that has puzzled scientists for many years. There are several theories that explain why these creatures disappeared from the face of the earth. One theory suggests that a massive asteroid impact caused a chain reaction that led to their extinction. Another theory suggests that a series of volcanic eruptions caused climate change that made it difficult for dinosaurs to survive.Personally, I believe that a combination of factors led to the extinction of dinosaurs. The asteroid impact would have caused widespread devastation, but it alone may not have been enough to wipe out all the dinosaurs. The volcanic eruptions may have made it difficult for the dinosaurs to find food and survive, but again, it alone may not have been enough.I think that the combination of these two events, along with other factors such as disease and competition for resources, led to the extinction of dinosaurs. It is also possible that some species of dinosaurs may have survived and evolved into the birds that we see today.中文：恐龙灭绝一直是一个困扰科学家多年的谜团。
恐龙灭绝的原因陨石说作文
恐龙灭绝的原因陨石说作文
英文回答：
The reason for the extinction of dinosaurs is believed
to be a massive asteroid impact. Scientists have found evidence of a huge crater in the Yucatán Peninsula in Mexico, which they believe was caused by an asteroid that struck the Earth around 66 million years ago. This impact would have caused widespread devastation, including wildfires, tsunamis, and a dramatic cooling of the Earth's climate. As a result, many species, including the dinosaurs, were unable to survive in the changed environment and eventually went extinct.
中文回答：
恐龙灭绝的原因被认为是一次巨大的陨石撞击。
科学家在墨西
哥的尤卡坦半岛发现了一个巨大的撞击坑，他们认为这是大约6600
万年前一颗陨石撞击地球所形成的。
这次撞击导致了广泛的破坏，
包括野火、海啸以及地球气候的急剧变冷。
因此，许多物种，包括恐龙，在这种变化的环境中无法生存，最终灭绝了。
恐龙灭绝陨石撞击说作文
恐龙灭绝陨石撞击说作文英文回答：The asteroid impact hypothesis, also known as the Alvarez hypothesis, is a widely accepted scientific theory that explains the extinction of the dinosaurs and other species at the end of the Cretaceous period. This theorywas first proposed in 1980 by the father-son team of Luis and Walter Alvarez.According to this hypothesis, an asteroid or cometabout 10 kilometers in diameter crashed into what is nowthe Yucatán Peninsula in Mexico about 66 million years ago. This impact created a massive crater, released enormous amounts of energy, and triggered a series of devastating events that led to the extinction of the dinosaurs.The impact would have caused a massive earthquake and created a huge tsunami. Additionally, the impact would have ejected vast amounts of dust and debris into the atmosphere,blocking out the sun and causing a global winter. The combination of these effects would have caused widespread wildfires, acid rain, and a rapid decline in global temperatures. These conditions would have made it extremely difficult for many species to survive.In support of this hypothesis, scientists have found a number of pieces of evidence. For example, they have found iridium-rich sediments in geological layers that correspond to the time of the extinction event. Iridium is a rare element that is found in meteorites, and its presence in these sediments suggests that an extraterrestrial object may have caused the extinction event.Furthermore, scientists have found evidence of a large impac t crater in the Yucatán Peninsula. This crater is about 180 kilometers in diameter and is thought to have been created by the impact of an asteroid or comet. The age of the crater corresponds to the time of the extinction event, providing further evidence for the asteroid impact hypothesis.The asteroid impact hypothesis is the most widely accepted scientific explanation for the extinction of the dinosaurs. However, there are some alternative theoriesthat have been proposed. For example, some scientists believe that the dinosaurs were killed by a massive volcanic eruption. Others believe that the extinction event was caused by a combination of factors, including climate change, disease, and competition with mammals.中文回答：恐龙灭绝陨石撞击说。
恐龙灭绝撞击说作文
恐龙灭绝撞击说作文英文回答：The Cretaceous–Paleogene (K-Pg) extinction event,which occurred approximately 66 million years ago, iswidely accepted to have been caused by the impact of alarge asteroid or comet into the Earth. This catastrophic event led to the extinction of numerous species, including all non-avian dinosaurs, and marked the end of the Cretaceous period and the beginning of the Paleogene period.The Chicxulub impactor, estimated to have been around10 kilometers in diameter, struck the Earth in what is now the Gulf of Mexico. The impact released an enormous amountof energy, causing widespread wildfires, tsunamis, and a dramatic increase in global temperatures. The resultingdust and debris blocked sunlight from reaching the Earth's surface, leading to a global winter that lasted for monthsor even years.The impact also triggered a series of environmental changes that disrupted the food chain, such as the collapse of marine plankton ecosystems. These changes had a devastating impact on both terrestrial and marine life, leading to the mass extinction of numerous species.Evidence supporting the impact hypothesis includes the presence of a large impact crater in the Gulf of Mexico, known as the Chicxulub crater. This crater, which is over 180 kilometers in diameter, is considered to be the scar left by the impact.Another piece of evidence is the presence of iridium, a rare element on Earth but common in asteroids and comets,in sediments from the K-Pg boundary. The high concentration of iridium in these sediments indicates that an extraterrestrial object was responsible for the extinction event.Furthermore, the discovery of shocked quartz grains, which are formed under extreme pressure and heat, provides additional support for the impact hypothesis. These grainshave been found in sediments from around the world, indicating that the impact was a global event.中文回答：白垩纪-古近纪灭绝事件（K-Pg 灭绝事件）。
撞击说恐龙灭绝作文
撞击说恐龙灭绝作文英文回答：The extinction of dinosaurs is a topic that has fascinated scientists and researchers for many years. There have been several theories proposed to explain their sudden disappearance from the Earth. One of the most widely accepted theories is the impact hypothesis, which suggests that a massive asteroid or comet collided with the Earth, causing widespread devastation and ultimately leading to the extinction of dinosaurs.The impact hypothesis gained significant support when evidence of a large impact crater was discovered in the Yucatan Peninsula in Mexico. This crater, known as the Chicxulub crater, is believed to have been formed by the impact of a 10-kilometer-wide asteroid. The impact would have released an enormous amount of energy, causing massive fires, earthquakes, and tsunamis. The resulting dust and debris would have blocked out the sun, leading to a globalcooling effect known as an "impact winter."This sudden change in climate would have had devastating effects on the dinosaurs and other species. The lack of sunlight would have disrupted the food chain, leading to a collapse in ecosystems. Additionally, the extreme temperatures and lack of food would have put immense pressure on the survival of dinosaurs.Furthermore, the impact would have caused widespread wildfires, releasing toxic gases and chemicals into the atmosphere. This would have further contributed to the destruction of habitats and the decline of dinosaur populations. The combination of these factors ultimately led to the extinction of dinosaurs.中文回答：恐龙灭绝的原因是科学家和研究人员多年来一直感到困惑的话题。
恐龙灭绝撞击说作文300字
恐龙灭绝撞击说作文300字英文回答：The extinction of dinosaurs was caused by a catastrophic event known as the Chicxulub impact. Approximately 66 million years ago, a massive asteroid or comet, estimated to be about 10 kilometers in diameter, collided with Earth. This impact had devastating consequences for the dinosaurs and many other species on the planet.The collision resulted in a massive explosion, releasing an enormous amount of energy. The impact caused widespread fires, earthquakes, and tsunamis. The dust and debris thrown into the atmosphere blocked sunlight, leading to a significant drop in temperature. This sudden climate change had a catastrophic effect on the ecosystems, disrupting food chains and causing mass extinctions.The dust and debris in the atmosphere also preventedphotosynthesis, which severely affected plant life. As plants died off, herbivorous dinosaurs lost their source of food, leading to their decline. Additionally, the lack of plant life had a cascading effect on the carnivorous dinosaurs, as they relied on herbivores for their survival.Furthermore, the impact caused a global wildfire that released massive amounts of carbon dioxide and other greenhouse gases into the atmosphere. This led to a rapid and extreme increase in global temperatures, known as the "impact winter." The combination of the impact winter and the loss of food sources ultimately led to the extinction of dinosaurs.中文回答：恐龙的灭绝是由一次被称为“奇克苏鲁撞击”的灾难性事件引起的。
恐龙灭绝之陨石撞击说作文
恐龙灭绝之陨石撞击说作文朋友们！今天咱们来聊聊恐龙灭绝的事儿，特别是那个听起来超级劲爆的“陨石撞击说”。
想象一下，很久很久以前，恐龙们还在地球上悠哉游哉地生活着，它们或
是霸气地巡视领地，或是悠闲地吃着植物。
可突然，“砰”的一声巨响，一颗
巨大的陨石从天而降，就像一个超级无敌大炸弹！
这颗陨石可不是一般的大，那家伙，简直就是个巨型怪兽！它以极快的速
度冲向地球，砸下来的瞬间，产生的能量那叫一个惊人。
据说啊，比好多好多
原子弹爆炸的能量加起来还要大！这一砸，直接就把地球砸了个大坑，尘土飞扬，遮天蔽日。
恐龙们当时估计都懵圈了，“啥情况？咋突然天就黑啦？”这一黑可不得了，植物没法好好进行光合作用，大批大批地死去。
食草恐龙没了食物，饿得
肚子咕咕叫，慢慢地也就倒下了。
食肉恐龙呢？它们倒是能吃点食草恐龙的尸
体撑一阵子，可时间一长，也没辙了。
而且啊，这陨石撞击还引发了一系列的灾难。
地震啦、火山喷发啦，到处
都是一片混乱。
恐龙们就算再强大，面对这样的灭顶之灾，也只能是欲哭无泪，叫天天不应，叫地地不灵。
所以说，这颗陨石就像是个宇宙来的超级杀手，一下子就把恐龙们的美好
生活给彻底终结了。
想想还真有点可怜那些大块头们，称霸地球那么久，结果
被一颗陨石给打败了。
不过呢，也正是因为恐龙的灭绝，才有了后来咱们人类出现和发展的机会。
所以，从某种角度来看，这陨石撞击也算是为人类的登场铺好了路。
怎么样，这个陨石撞击导致恐龙灭绝的说法是不是很神奇？。
恐龙灭绝陨石撞击说作文
恐龙灭绝陨石撞击说作文
在很久很久以前啊，那天夜里，一颗大得不得了的陨石突然从
天上砸下来，整个天空都亮得跟白天一样，声音轰隆隆的，像是一
万个雷同时炸响。
那时候啊，地球就好像被扔进了搅拌机，啥都不
剩了。
说到恐龙啊，那些大家伙，平时都是横着走的，但那天陨石一来，它们也慌得不行。
地震摇啊摇，火山喷啊喷，海啸一个接一个，恐龙们四处逃窜，叫得那叫一个凄惨啊。
可惜啊，它们再咋挣扎也
逃不过这一劫。
那陨石一撞，不只是恐龙遭殃，整个地球都乱了套。
火山喷出
的灰把天都遮住了，阳光都照不进来，冷得跟冰窖一样。
恐龙们吃
的喝的都没了，饿得只剩下皮包骨，最后都冻死饿死了。
这陨石一撞啊，还影响了整个地球的生态。
树啊草啊都死了个
精光，氧气越来越少，气候变得跟以前完全不一样。
恐龙们啊，以
前咋活都活不下去，最后就慢慢消失了。
后来啊，恐龙都灭绝了，哺乳动物开始崛起。
说起来，恐龙以
前那么威风，最后还不是成了历史的一部分。
咱们现在一抬头看到星星，就会想起那个晚上，那颗陨石，还有那些曾经统治过地球的恐龙们。
哎，都是过去的事儿了。
恐龙灭绝逻辑顺序作文
恐龙灭绝逻辑顺序作文
昨天我看电视时，发现有一个关于恐龙的电台。
我很好奇，看了一会儿。
电视上说:恐龙的灭绝是公众舆论的大事。
有许多理论，如陨石碰撞理论、气候变化理论、物种斗争理论、大陆漂移理论、地磁变化理论等。
最可信的是陨石碰撞理论。
陨石碰撞是指:在恐龙时代结束时，一颗巨大的陨石从天而降。
正当他准备逃离大气层时，许多恐龙看不见这个世界。
这时，气温高达40摄氏度，许多恐龙相继死亡。
这不是最可怕的。
最可怕的事情是这颗恒星撞上了地球，森林燃起了大火。
这颗行星突然被分成数百块石头，飞向大气层，然后坠落下来。
它带着火光飞向地球。
大部分土地变成了火焰。
一些巨石坠入大海，导致大海啸淹没了许多岛屿。
恐龙自然灭绝了。
物种斗争是在恐龙时代结束时，第一个小型哺乳动物出现了。
这些动物属于啮齿类食肉动物，可能吃恐龙蛋。
这种小动物缺少天敌，数量越来越多，最终吃掉了恐龙蛋。
恐龙灭绝不到这些种类，要想真正知道，还取决于科学家的能力。
撞击说恐龙灭绝作文
撞击说恐龙灭绝作文英文回答，The impact theory suggests that a massive asteroid or comet collided with the Earth approximately 65 million years ago, leading to the extinction of the dinosaurs. This catastrophic event caused widespread fires, tsunamis, and a drastic change in climate, which ultimately led to the demise of the dinosaurs and many other species.The collision would have released an enormous amount of debris and dust into the atmosphere, blocking out the sun and causing a significant drop in temperature. This would have disrupted the food chain and led to a mass extinction event, wiping out approximately 75% of all species on Earth.The evidence supporting the impact theory includes the discovery of a layer of sediment rich in iridium, which is rare on Earth but common in asteroids and comets. Additionally, the presence of shocked quartz and microtektites in the same sediment layer further supportsthe idea of a high-velocity impact.中文回答，撞击说认为大约6500万年前，一颗巨大的小行星或彗星与地球发生了碰撞，导致恐龙灭绝。
恐龙灭绝的原因作文
恐龙灭绝的原因作文英文回答：The extinction of dinosaurs is a topic that has fascinated scientists and researchers for decades. There are several theories that attempt to explain why these magnificent creatures disappeared from the face of the Earth. In this essay, I will explore two of the most widely accepted explanations for the extinction of dinosaurs.One theory suggests that a catastrophic event, such as an asteroid impact, caused the extinction of dinosaurs. This theory is supported by the discovery of a large impact crater in the Yucatan Peninsula in Mexico, known as the Chicxulub crater. The impact of the asteroid is believed to have released immense amounts of energy, causing widespread destruction and climate change. The resulting dust and debris would have blocked out the sun, leading to a decrease in temperature and a disruption of the food chain. Without access to sunlight and a stable food source,dinosaurs would have struggled to survive.Another theory proposes that the extinction ofdinosaurs was a result of gradual environmental changes. Over millions of years, the Earth's climate underwent significant transformations. The gradual cooling of the planet and the formation of polar ice caps would have resulted in a decrease in available habitats and food sources for dinosaurs. Additionally, the rise of flowering plants may have also played a role in their demise. Dinosaurs were primarily herbivorous, and the emergence of new plant species could have disrupted their diet and caused a decline in their population.中文回答：恐龙灭绝是一个几十年来一直吸引着科学家和研究人员的话题。
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GRE写作素材之陨石撞击和恐龙的灭绝对于想要攻克GRE考试的考生来说，有一定的课外知识，可帮助考生更加迅速的理解考题。
针对复杂多变的GRE写作题目，课外知识的积累，就变得尤为重要。
今天，前程百利小编为大家带来的是GRE写作素材之陨石撞击和恐龙灭绝，希望对同学们的GRE考试有所帮助，下面就和小编一起来学习一下吧！Meteorite Impact（陨石撞击）and Dinosaur Extinction（恐龙的灭绝）There is increasing evidence that the impacts of meteorites have had important effects on Earth, particularly in the field of biological evolution. Such impacts continue to pose a natural hazard（自然威胁）to life on Earth. Twice in the twentieth century, large meteorite objects are known to have collided with Earth.越来越多的证据表明陨石撞击对地球造成的影响特别严重，尤其是生物进化领域。
这种影响对地球上的生物来说，仍然是一种自然威胁。
在20世纪，被人们所知悉的就有两次大型陨石撞地球的事件发生。
If an impact is large enough, it can disturb the environment of the entire Earth and cause an ecological catastrophe. The best-documented such impact took place 65 million years ago at the end of the Cretaceous period（白垩纪）of geological history. This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct. While there are a dozen or more mass extinctions in the geological record, the Cretaceous massextinction has always intrigued （感兴趣）paleontologists （古生物学家）because it marks the end of the age of the dinosaurs. For tens of millions of years, those great creatures had flourished. Then, suddenly, they disappeared.当撞击力度特别大时，陨石和地球的相撞将扰乱整个地球的环境，并引发一场生态灾难。
记载最完整的这种灾难曾发生在6 500万年前，在地质历史阶段的白垩纪末期。
地球历史上的那次重大灾难造成了大量生物死亡，当时多达一半的物种灭绝。
根据地质史料记载，地球上有十几次甚至更多大型的物种灭绝，古生物学家一直对白垩纪大灭绝非常感兴趣，因为它标志着恐龙时代的结束。
数千万年以来，那些庞大的生物繁盛活跃着；然后突然间，它们消失了。
The body that impacted Earth at the end of the Cretaceous period was a meteorite （陨石）with a mass of more than a trillion tons and a diameter（直径）of at least 10 kilometers. Scientists first identified this impact in 1980 from the worldwide layer of sediment（沉积）deposited from the dust cloud that enveloped the planet after the impact. This sediment layer is enriched in the rare metal iridium and other elements that are relatively abundant in a meteorite but very rare in the crust of Earth. Even diluted（削弱）by the terrestrial（陆地的）material excavated from the crater, this component of meteorites is easily identified. By 1990 geologists had located the impact site itself in the Yucat region of Mexico. The crater, now deeply buried in sediment, was originally about 200 kilometers in diameter.将大量尘埃扬起至大气层中，尘埃降至地面后逐渐形成沉积岩，通过测量沉积岩的厚度，我们可以判断当时的大气中的尘埃约有100万亿吨。
如此大量的物质存在于大气层中，将会完全阻隔了阳光的照射，于是地球一瞬间进入了一个持续数月之久的寒冷黑暗时期。
据估计，爆炸过程还产生了大量的硝酸和被溶解的岩浆并喷出地球外，造成了大面积火灾，大部分的森林和草原被燃尽。
这些环境灾难很可能就是包括恐龙在内的大规模物种灭绝的原因。
This impact released an enormous amount of energy, excavating a crater （火山口）about twice as large as the lunar crater Tycho. The explosion lifted about 100 trillion tons of dust into the atmosphere, as can be determined by measuring the thickness of the sediment layer formed when this dust settled to the surface. Such a quantity of material would have blocked the sunlight completely from reaching the surface, plunging （跳入）Earth into a period of cold and darkness that lasted at least several months. The explosion is also calculated to have produced vast quantities of nitric acid and melted rock that sprayed out over much of Earth, starting widespread fires that must have consumed most terrestrial forests and grassland. Presumably, those environmental disasters could have been responsible for the mass extinction, including the death of the dinosaurs.白垩纪末期，撞击地球主体是一块巨大陨石，它的质量超过万亿吨，直径至少在10公里。
1980年科学家通过研究撞击后形成的、覆盖地球表面的尘雾沉积层，首次确认了这次撞击。
该沉积层富含稀有金属铱和其他在陨石中含量较丰富但在地壳中却很稀有的元素。
即便这些物质从陨石坑被挖掘出来后受到地球物质的稀释，其中的成分仍然很容易被鉴定出来。
1990年，地质学家已经将那次撞击的地点定位于墨西哥的尤卡地区。
现在被深埋于沉积物中的陨石坑，最初的直径为200公里左右。
Several other mass extinctions in the geological record have been tentatively identified with large impacts, but none is so dramatic as the Cretaceous event. But even without such specific documentation, it is clear that impacts of this size do occur and that their results can be catastrophic. What is a catastrophe for one group of living things, however, may create opportunities for another group. Following each mass extinction, there is a sudden evolutionary burst as new species develop to fill the ecological niches opened by the event.这次撞击释放出了巨大的能量，凿出了一个约为月球第谷山口面积的两倍大的陨石坑。
那场爆炸根据地质学记载，一些其他大批生物的灭绝也被初步认定认为与类似的撞击有关，但都没有白垩纪的那次触目惊心。
不过即便是没有具体史料依据，这种规模的撞击显然发生过，并且带来了灾难性的后果。
然而对于一个生物种群而言算是大灾难，却有可能给另一个种群创造了机会。
每一次大灭绝过后，都会有新的物种爆炸式地进化去填补由灭绝造成的物种空缺。
Impacts by meteorites（陨石）represent one mechanism（机制）that could cause global catastrophes and seriously influence he evolution of life all over theplanet. According to some estimates（估计）, the majority of all extinctions of species may be due to such impacts. Such a perspective fundamentally changes our view of biological evolution. The standard criterion for the survival of a species is its success in competing with other species and adapting to slowly changing environments. Yet an equally important criterion is the ability of a species to survive random global ecological catastrophes due to impacts.陨石撞击描绘了一个能够制造全球性的灾难的途径，这种灾难会对整个星球的生命体的进化带来重大影响。