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The extinction of dinosaurs must have been related to a major event. Something enormous had to have happened in order to completely devastate these really massive animals.

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Introduction

Dinosaurs' Extinction: An Incredible Mystery by Shahznane Molou Introduction to Geoscience Dr. Peter Bolton 26 March 2009 Index Content......................................................................................................................................3 Bibliography...............................................................................................................................8 What were the dinosaurs? The first dinosaurs appeared 230 million years ago during the Mesozoic era which is also called "The Age of the Dinosaurs". They survived ice age until a big natural phenomenon hit the earth and extinct them (Buckley, 1997). There were basically two types of dinosaurs living in the earth. They were the Saurischia which were the dinosaurs of similar hips to reptiles of today; and the Ornithischia which were of bird hips. Scientists distinguished the reptilian hips due to the steepness of the hips themselves compared to the other bird-hipped dinosaurs (Power point on Dinosaurs from Dr. Bolton). A huge argument scientists have been through is whether dinosaurs were warm-blooded or cold blooded. The evidences that prove the first argument are the bone structures dinosaurs had which are very similar to us human beings. Their long legs show that dinosaurs were fast runners so there are chances they were warm blooded. However, other scientists also argue that dinosaurs may have been of cold blood due to the fact that most of them had scales like the reptiles, which are cold blooded. ...read more.

Middle

The whole food chain then would have got disrupted and everything died out. Scientists discussed that asteroids contain quite a lot of iridium in them (BBC). They argue that as the asteroids hit the earth, the blast was so intense that the iridium spread all across the world in different parts. It was Yan Smith who first discovered the traces of the impacts by finding tiny balls of rocks in the K-T boundary. He claimed that they were the kinds of rocks that were created by really hot effects. In other words, something so hot might have happened in order to leave traces like these tiny balls of rocks, called spherules. When the big asteroid hit the earth, so many rocks may have flown in vapour. And as they landed back onto the earth, they landed with extreme amounts of heat, which may have created huge fires in the whole earth. These fires therefore explain the level of soot that scientists have found in addition to the Iridium in the K-T boundary. It was also said by scientists that the asteroid impact had created the fall of acid rain which was so chemical that it poisoned all water bodies. ...read more.

Conclusion

The food chain was then disrupted again since there were less living species with time going. Because climate changed too radically, dinosaurs could not stand the weather; they would have frozen as they were exothermic (Buckley, 1997). Also, as climate would change, the ice caps would enlarge which would therefore lower the water level in the earth. The dinosaurs would have died due to lack of water. These three theories are not evidences of the true reason to dinosaurs' extinction. Their extinction is still a big mystery to the world researchers. However, one can deduct by comparing and contrasting the three different theories that they are quite similar in a way. Although we might not know the real reason to dinosaurs' extinction, we may deduct that there was a drastic climate change in the earth that made it unbearable for them to live. All scientists are sure of is that such a big phenomenon has occurred at that time that it created gigantic impacts on the climate which resulted in their disappearance. However the answer maybe as simpler as this: that with time the dinosaurs have gradually just come to an end. It is also said an event similar to the K-T event is very likely to happen again if one takes account of the global warming and environmental changes the earth is going through. ...read more.

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