Triassic-Trissic Extinction Research Paper

8. The periods in which there were mass extinctions are Permian – volcanic eruptions which spewed lava and put CO2 into the air which warmed the climate an estimated 6 degrees Celsius. The resulting of oxygen deficiency. And Cretaceous – asteroid or comet

The Cretaceous period is a period of time within the Mesozoic Era lasting from 146 million years ago to 65.5 million years ago. It is one of three periods in the Mesozoic Era along with the Triassic and Jurassic periods. The Cretaceous period is well known for the amount of dinosaurs it had, and the event that put an end to the dinosaurs reign, the K-T mass extinction. During the K-T mass extinction, a huge asteroid hit earth and caused tons of dust to infiltrate the air. Only a small portion of dinosaurs died on impact Instead, the dust blocked out sunlight which caused plants to die. Without plants, many dinosaurs did not have a food source, so the died out. Carnivore dinosaurs, such as the Tyrannosaurus Rex, survived a little longer

Dinosaurs ruled the earth for over 65 million years and thankfully for the human race, they became extinct. Ultimately, only a major catastrophe could completely wipe out an entire species, let alone an entity of dinosaurs and the debacle on the causes of dinosaur extinction have flooded the minds of paleontologists for centuries. Geologist and zoologist Stephen Jay Gould published “Sex, Drugs, Disasters, and the Extinction of Dinosaurs,” to compare scientific and speculative causes of dinosaur decimation. Personally, I found this passage very informational and enjoyed reading it. Gould provides three theories that capture the reader’s curiosity, allowing room for pondering in one’s mind.

In To Kill a Mockingbird, one of Atticus Finch’s most significant qualities, courage, impacts the story. Throughout the book, Harper Lee portrays courage as doing something out of your comfort zone, for the greater good or a good cause. The first example shows how Atticus’s quality of courage impacts the story. Atticus is sitting in front of the jail cell where Tom Robinson, the African-American man he is defending, is being kept. When Mr. Cunningham and the rest of his followers confront Atticus, he stays strong, keeps his ground and doesn’t let anything happen to Tom. The interaction starts with Mr. Cunningham approaching Atticus, “He in there, Mr. Finch? He is, and he’s asleep. Don’t wake him up. In obedience to my father. There followed what I later realized was a sickeningly comic aspect of an unfunny situation: the men talked in near-whispers. You know what we want. Get Aside from the door, Mr. Finch. You can turn around and go home, Walter. Heck Tate’s around somewhere.”(171-172) Atticus stops Mr. Cunningham and his men from harming Tom before his trial. It took courage to stand up to men who are usually cordial with him resulting in Tom not being killed and allowing the trial to continue. In the second example, it shows how Atticus’s actions reflect what how Harper Lee believes courage looks like in everybody. Atticus is brought to a tough decision in whether or whether not to defend Tom Robinson. When Scout asks him about the case and why he decided

The Cretaceous – Tertiary mass extinction, commonly referred to as the KT extinction, occurred 65 million years ago. As the most recant extinction event it is more easily studied as more evidence has been preserved than for the earlier extinctions. This extinction is the most commonly known, as it is the extinction of the dinosaurs, but the smallest scale mass extinction with only 76% of species dying out.

The fifth, and one of the largest and most well known extinctions in Earths history was the Cretaceous period, where many species, including the dinosaurs, pterosaurs, and large marine reptiles, disappeared. This period was widely known as the K-T period, K being the traditional abbreviation for the Cretaceous Period derived from the German name Kreidezeit, and T being the abbreviation for the Tertiary Period (a historical term for the period of time now covered by the Paleogene and Neogene periods). It was a relatively warm climate and had high global sea levels. The oceans and seas were populated with now extinct marine reptiles, ammonites and rudists, and the land by dinosaurs. At the same time, new groups of mammals and birds as well as flowering plants appeared. The early part of the Cretaceous showed a cooling trend that had been

this mass extinction is what brought us the jurassic period, and from the Jurassic period, or the

The Cretaceous-Tertiary extinction, also known as the K-T extinction, was a global extinction event that struck the Yucatan Peninsula at the end of the end of the Mesozoic Era, 65 million years ago. Walter Alvarez first discovered a meteorite big enough to be called a small asteroid that hit the Earth, creating the Chicxulub crater. Once the asteroid struck the North American continent, there were igneous rocks underneath the crater that contained high levels of a rare siderophile element, iridium. This catrostopic event had a massive effect on the environment, as several mammals, birds, and plants became extinct. It also caused an impact winter that made it impossible for plants and plankton to photosynthesis, as 75% of inland animals and 90% of marine species were affected. Not only did it cause an impact winter, but the asteroid also caused volcanic eruptions, climate change and sea level rise. Geologists have also found rich dinosaur, plant and marine fossils to illustrate the K-T extinction. This event not only caused species to become extinct, but it also had an adaptive radiation, as other species were able to diversify.

The cretaceous-tertiary (KT) boundary extinction happened approximately sixty five million years ago. Sixty to eighty percent of all living species became extinct at this boundary (Raup 1988). The KT extinction was indeed a mass extinction event. Mass extinctions are periods in Earth's history when extremely large numbers of species die out simultaneously or within a limited time frame. The most severe mass extinction ever occurred at the end of the Permian period when 96% of all species died out. The K-T mass extinction obliterated almost all the large vertebrates on Earth, on land, at sea, and in the air (all dinosaurs, plesiosaurs, mosasaurs, and pterosaurs) suddenly became extinct at the end of the Cretaceous Period. At the same time, most

   When Edgar Allan Poe wrote "The Fall of the House of Usher," two factors greatly influenced his writing. A first influence was John Locke's idea of Empiricism, which was the idea that all knowledge was gained by experiences, exclusively through the senses. A second vital influence was Transcendentalism, which was a reaction to Empiricism.  While John Locke believed that reality or truth was constituted by the material world and by the senses, Transcendentalists believed that reality and truth exist within the spiritual or ideal world. They believed that the external world was dependent solely on the conscious. Beverly Voloshin suggests that "Poe presents transcendental

The most well-known extinction event is when the dinosaurs went extinct, although they are not the only organism that perished. This event took place about 65 million years ago, between the Cretaceous and Tertiary periods and wiped out nearly 75% of plants and animals (Principles of Biology). Our book says that most dinosaurs and many other sauropsid lineages died, but many lineages survived, including bird. Crocodiles are lineage of dinosaurs and are often studied to see how they have changed over millions of years, turtles are also part of the lineage that survived. Asteroid impact hypothesis which can be found in class rooms, some textbooks and on TV or in movies has been well explained and accepted as the cause of the extinction of dinosaurs. There is geological evidence that supports a large asteroid creating the Chicxulub crater on the Yucatan Peninsula of Mexico, but the supposed consequences of the event alone cannot account for the major extinctions (Principles of Biology). They say that something else had to also happen in order for all the diversity of animals that became extinct, which would be expected when such a large object impacted earth at what is thought to have been at a high speed too. Changes in sea level and massive volcanic eruptions were also altering the environment, so all this combined is likely what cause the diversity in the extinction event (Principles of

Over 98% of all organisms that have lived on Earth are now extinct. A mass extinction event occurs when a large number of species die out within a small time frame (relative to the age of Earth). Mass extinctions are intensively studied for both cause and effect, as there is usually room for debate regarding catalysts that precede the extinction and the massive influx of new biological species that follows. There have been five major mass extinctions, dubbed the “Big Five,” that have wiped out at least 50% of the species living at those times. The most well known mass extinction of the Big Five, with the decimation of every species of non-avian dinosaur, is the Cretaceous-Paleogene

“A minority disputes this theory, arguing that other events-such as volcanic eruptions, sea-level changes or a series of impacts-were to blame for the spectacular loss of species that occurred at the transition between the Cretaceous and Tertiary periods…”

Ever since the history of Earth has been studied using fossil records, extinctions have always been the object of fascination and interest, particularly the mass extinctions that occurred throughout Earth's history. A mass extinction can be caused by disruptive global environmental changes, where large numbers of species have become extinct (Urry et al. 2008). There have been five major extinctions documented based on fossil records over the past 500 million years, but the Cretaceous (KT boundary extinction – a name that meant it began the Tertiary era) extinction caught a lot of

There have been five well known extinctions on this earth. The one most well known is the mass extinction that ended the dinosaurs. Mass extinction is often described as the elimination of a large number of species in a short period of time. Despite what many think, the elimination of species is almost commonplace at this point. The Earth is currently in the middle of a sixth mass extinction, and it’s been caused by the human race.