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What killed the dinosaurs? Im going to write about two different theories that could explain what killed the dinosaurs.

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Introduction

What killed the dinosaurs? Contents page Introduction 3 What did the dinosaurs eat? 3 The KT boundary 4 Luis Alvarez: the impact theory 5 Gerta keller: the volcano theory 6 Conclusion 7 References 7 Introduction Dinosaurs are reptiles that lived for over a 170 million years on the planet. Then 65 million years ago they became extinct along with other animals and plants, it was a mass extinction. I'm going to write about two different theories that could have killed the dinosaurs. What did the dinosaurs eat? The best known of the dinosaurs was the T. rex. It was a huge meat-eating dinosaur that lived about 85 million to 65 million years ago. T. rex lived in a humid, semi-tropical environment, in open forests with nearby rivers and in coastal forested swamps. The seasons were mild. The climate was warmer than today. But not all dinosaurs were carnivores The Corythosaurus was a large, plant-eating, duck-billed dinosaur. The earth was full of vegetation so finding food was not a problem. ...read more.

Middle

http://en.wikipedia.org/wiki/K%E2%80%93T_boundary Luis Alvarez: the impact theory Luis Alvarez and his son Walter found evidence during their research that the dinosaurs might have killed the dinosaurs. While they were investigating the KT boundary in northern Italy, Walter and Luis found iridium in clay. Iridium on the surface of the earth is unusual. But iridium is found in abundance in meteorites. After further studies were conducted they found that iridium was found at the KT boundary all over the world. Then other scientists found a crater at Chicxulub in Mexico which is shown in the picture. The picture shows a 180 kilometres (110 mi) wide ring of the crater, big enough to cause a catastrophic event. The resulting dust clouds would block sunlight and stop photosynthesis for a few years. This would account for the extinction of many plants and animals because there just wouldn't be enough food. The impact would also cause firestorms amongst all the vegetation killing even more plants. ...read more.

Conclusion

http://www.sciencedaily.com/releases/2009/04/090427010803.htm Some debate remains as to the total duration of Deccan volcanism, but flows of the main lava pile have been dated consistently between 64 and 67 million years ago. http://www.largeigneousprovinces.org/07may.html Conclusion Although the impact theory is very popular in the media as the cause of a mass extinction I think that Gerta Keller provides more convincing evidence. I think the gases released into the air from a volcano and all the hot ash would be devastating for plants and animals at that time. Also, the iridium at the KT boundary supports both theories. Maybe it's more likely that the events happened close to each other giving the earth a double catastrophe which would have caused a mass extinction. Gerta Keller suggests that this might have been the case. References http://www.prehistory.com/timeline/cretace.htm http://www.enchantedlearning.com/subjects/dinosaurs/dinos/Corythosaurus.shtml http://en.wikipedia.org/wiki/Tyrannosaurus http://en.wikipedia.org/wiki/K%E2%80%93T_boundary Wikipedia is an encyclopaedia it is used by millions of people over the world. It uses very scientific language and the pages i used were recent 23 September 2010 at 9:15. It always lists the references at the bottom of the page and sometimes there are loads. ...read more.

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