Dinosaur Extintion Essay

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What Caused the Extinction of Dinosaurs ? Case study Coursework By Jordan Taylor Contents- Page 1- Introduction About Dinosaurs Page 2 and 3- Time periods of the dinosaurs Page 4 and 5- Theories on how dinosaurs became extinct- Catastrophic theories Page 6 and 7- Information on Iridium levels Page 8- Gradual extinction theories Introduction In my case study, I will be looking at what killed the once dominant dinosaurs. I will look at and compare different theories on how the dinosaurs became extinct. I will look at the evidence backing the theories. Scientists have created two groups to put the theories into; Either Catastrophic extinction or Gradual extinction. Catastrophic extinction would have been caused suddenly such as an asteroid colliding with earth or a series of eruptions from Volcanoes. Gradual extinction would have been as a result of changes to earths global temperature or survival of the fittest through new stronger animals winning in the struggle for existence. Dinosaurs Dinosaurs were the dominant land animals for 160 million years, from the late Triassic period (About 230 million years ago) until the end of the Cretaceous period (about 65 million years ago) making them one of the most successful groups of animals ever to have walked the earth. The name dinosaur translates as 'terrible or wondrous lizards' and they certainly evolved in a huge range of sizes and shapes, from the gigantic plant-eating sauropods to the quick meat-eating tyrannosaurs. So far, the remains of over 1,000 different dinosaur species have been identified from fossils the extinction of most dinosaurs species occurred in the Cretaceous-Tertiary Extinction event. Fossil records show that birds evolved within the Theropod dinosaurs during the Jurassic period. Some birds survived the Cretaceous-Tertiary Extinction event from which modern birds

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