In the article titled “Meteor likely caused the Earth’s Greatest Extinction Event” the author states that “About 60 meteorites five or more kilometers across have hit the earth in the past 600 million years. The smallest ones would have carved craters some 95 kilometers wide. “Most scientists agree that one such impact did in the dinosaurs‚ but evidence for large collisions coincident with other mass extinctions remained elusive until recently.”The increased attention brought about the discovery
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There are many theories on how dinosaurs became extinct but scientists have not yet found a proven reason why. About sixty-five million years ago Dinosauriformes‚ or as we call them Dinosaurs‚ walked and roamed planet Earth. These massive carnivores‚ herbivores‚ and omnivores lived many years on earth before humans appeared. There were several variations of dinosaurs such as land‚ sea‚ and air dinosaurs. For a millions of years the dinosaurs thrived in their environment. They had an abundant food
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The Age of the Dinosaur is the Mesozoic era. Its’ geological time lasted from 180 million years ago (MA) from 250 MA to 65 MA. The Mesozoic era began after the end of the Permian extinction. It has been estimated that the Permian extinction wiped out approximately 95% of marine life and about 70% of all other species on the plant. The Mesozoic era consists of three geological time periods Triassic‚ Jurassic and Cretaceous. In the era of Mesozoic period the earth’s continents were a supercontinent
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The mass extinction of dinosaurs is still a mystery today but their are many theories supporting how and why approximately 70% of all living species on earth suddenly became extinct including dinosaurs‚ 66 million years ago. The most common and realistic theory is the astroid impact theory when a astroid 6-15 km in diameter hit earth with the force of five billion atomic bombs. Another possible theory is climate change‚ the dinosaurs didn’t adapt fast enough to the climate when it was changing and
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Dinosaurs for 163 million years had roamed the Earth (Dinosaur Worlds). They thrived and were one of the most successful groups of animals in the history of life on land(PBS). Then‚ 66 million years ago‚ the last group of dinosaurs disappeared forever; leaving us with the question - what killed the dinosaurs?‚ and whether it a gradual or a quick and calamitous end? “Cretaceous-Paleogene Extinction Event‚ or the K-Pg for short”(SciShow)‚ that took such a significant blow to life on Earth it marked
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Topic: Why Did Dinosaurs Go Extinct? A Gradual and Sudden End to Their Reign Introduction: About 65 mya almost three quarters of the animal and plant species on earth went extinct. This mass extinction is known as the Cretaceous-Paleogene (K-Pg) extinction event. The Cretaceous was the last period of the Mesozoic Era which is when dinosaurs lived from about 250 to 65 mya and the Paleogene is the first period of the Cenozoic Era that started about 65 mya which is the Era that we are currently living
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For over 150 million years‚ dinosaurs dominated Earth. They were incredibly successful-so successful in fact that all of the other animal groups had no choice but to play a secondary role in nature. 65 million years ago‚ however‚ every species of dinosaur went extinct as well mosasaurs‚ plesiosaurs‚ pterosaurs‚ ammonites‚ and many families of brachiopods and sea sponges. Also‚ many shark species as well as most vegetation did not survive(“Dinosaur Extinction”). What could have possibly killed off
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A number of different theories have been assessed throughout the course of this research to attempt to reach a conclusion as to the reason behind the extinction of the Tyrannosaurus Rex. Although all arguments are credible‚ and supportive with educated information and data‚ the most conclusive theory of all is The Alvarez Asteroid Impact theory. Alvarez‚ a researcher at the University of California‚ discovered a pencil thin layer of Iridium around the rocks in Gubbio‚ Italy. (New Scientist‚
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Geological of the western interior during the Mesozoic Era Abstract The Mesozoic Era “the middle life” is the second major Era that lies between the Paleozoic Era and the Cenozoic Era. Geologist believe that this Era took place from 248 to 65 million years ago. The earth during this time was different from what we know today. The shape of the earth and life during this time period has changed dramatically. Starting with an overview of the Mesozoic Era and its subdivisions periods I will focus
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THE GEOLOGIC TIMESCALE Divisions of Geologic Time * Eras are subdivided into periods...periods are subdivided into epochs. * Geological time begins with Precambrian Time. Precambrian time covers approximately 88% of Earth’s history. FOUR Eras… * PRE-CAMBRIAN – 88% of earth’s history * Paleozoic (ancient life) * 544 million years ago…lasted 300 million yrs * Mesozoic (middle life) * 245 million years ago…lasted 180 million yrs * Cenozoic
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