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Sponsored Links Dinosaurs became extinct about 65 million years ago at the end of the cretaceous period (see what cretaceous dinosaurs were around at this time). Scientists call it a mass extinction – it wasn’t the first mass extinction in earth’s history and it probably won’t be the last!Having existed for 165 million years, why did dinosaurs die out?The collision that annihilated the dinosaurs should have left a crater about 90 to 120 miles across. We are trying to study in this paper evidence of existence of Dinosaurs and if they existed, what did they eat, what were their behavioral patterns, and also study theories about why and how did they become extinct from this planet Importance/Utility of study of Existence and extinctions of Dinosaurs: Finding the true reason for the dinosaur's extinction to many people is not an important matter. Extinction of Dinosaurs: There are dozens of theories to explain a probable cause or causes of extinction. The Age of Dinosaurs The "Age of Dinosaurs" also known as the Mesozoic Era began over 245 million years ago. During the early Triassic, corals appeared and ammonites recovered from the Permian extinction. Roughly 248 million years ago, the Permo-Triassic period extinction occurred. Dinosaurs Dinosaur is the name given to prehistoric that lived on the earth for about 160 million years. Fossil dinosaur eggs suggest that at least some dinosaurs laid hard shelled eggs. It wasn't just the dinosaurs that died out in this extinction. The Dinosaur Heresies: New Theories Unlocking the Mystery of the Dinosaurs and Their Extinction by Robert T. The End of the Dinosaurs : Chicxulub Crater and Mass Extinctions by Charles Frankel (Author) (Hardcover - October 1999) 4.
The explosion followed "with the force of a hundred million million tons of TNT", threw dust enriched with iridium high into the atmosphere.
This shut off sunlight for weeks or months and cooled the planet.
Imagine our world, after the devastation of an asteroid impact, completely dark and everything we love about our planet dying right before our eyes. They probably had difficulty cooling off in the summer thus, death and extinction came as a result of the changes in climate. Although both of these theories present valid arguments, many scientist believe that no one theory answers all the questions leading to the extinction of dinosaurs. Simply put, one of the most intriguing puzzles of all time, is the life and death of the dinosaurs. Perhaps the one aspect of the dinosaur world that draws us in so vehemently, is their extinction. Due to their overwhelming popularity it would be extremely difficult to overestimate the amount of time, research and extensive brain power that has gone into attempting to discover the true cause of the extinction of the dinosaurs. Among the many causes given for the extinction of dinosaurs, a few are poisonous plants, germs and disease, drastic change in temperature, and drastic cha...
How would we live and what would we feed our children, if all plants and animals were gone? As Arlan Allan says, impact craters, 139 were scattered over the surface of the earth, have been identified by scientists. In order to illustrate his point, Gould uses scientific reasoning to compare three theories that attempt to explain the extinction of the dinosaur. Siegel, who presumed that massive overdosing due to poisonous flowering plants (drugs) may have caused the extinction of the dinosaur and finally, the theory of Luis and Walter Alvarez which is focused on the possibility of a huge asteroid striking earth and causing the dinosaurs, as well as other species, to become extinct. Also, as Gould points out, this theory does not take into account the extinction of several species of marine l... This catastrophic extinction opened the doorway to the rise of dinosaurs and mammals.... Probably the most famous is the extinction that finally saw the end of the dinosaurs reign on the Earth, 65 million years ago.
For example,the world-wide forest fire claim doesn't stand up to examination.
Fossil tree leaves contemporary with the impact & within about 2,000 miles of it have been discovered unburned,& it is impossible to start a wildfire in really damp rainforest.They find insufficient evidence that it was more important than the Chixculub impact for mass extinction.Its relevance to climate change is, again, a separate idea that doesn't really have anything to do with the rest of what you say, since climate change and mass extinctions, while related, are not the same thing.A large meteor could destroy human life if it were to strike the Earth.This paper will show that what happened to the dinosaurs, could happen to us. Stephens goes on to say, most scientists agree that 65 million years ago, a six-mile wide asteroid traveling nine miles per second, "a hundred times faster than a speeding bullet," slammed into Earth.There are many different theories about why this happened.We will probably never know exactly what happened, which means that scientists will continue to disagree and come up with different dinosaur extinction theories.It is thought that the impact would have caused massive damage, including a giant dust cloud which lead to massive changes in the climate.This would have destroyed lots of the cretaceous plants, so herbivorous dinosaurs starved and the meat eating ones were left with nothing to eat either.Acid rain and wild fires were also present after the impact.Many plants died, as well as the animals that ate the plants (Stephens 21).