type of impact on the Earth around 65 million years ago, and the K/T boundary marks it. For quite a bit of time, it was hard to see where such an impact could take place. There had to be some sort of evidence scarring the face of the Earth if had such a terrible effect. In the 1990s a possible candidate for supporting evidence emerged. The Chicxulub crater in the Yucatan peninsula came into the spotlight. The crater is enormous. The crater itself and the rings of material that the impact produced stretch roughly 106-186 miles (170-300 km) across. The hardened molten rock from the impact proved to be the key to time. Remember, only igneous rocks can be properly dated by radioactive measurement. This allowed for the material in the crater to be dated at 64-65 million years old.All of this seems to link everything together, details and the known dates. But how did an impact of this sort selectively kill off species? The answer could possibly be that the extinction was gradual, with only rarer and weaker creatures and organisms fading out in the long run. A lot of the marine life came to extinction due to acceleration by oceanic changes rather than directly caused by impact. Why did some species become extinct and some others did not? There is no cemetery for us to examine at the boundary, so comparing evidence from the two eras is problematic. Possibly, life forms that were already in decline became extinct. On the other hand, organisms that were on the brink of major expansion also disappeared from the planet.CONCLUSIONThere always will be argument over exactly what caused the extinction of the dinosaurs and other species. Most evidence does put the meteor impact at the root of the event. Unless technology improves or concrete evidence comes forward, we will stilled be mired in the chaos of personal belief and preference.1.TITLE: THE GREAT DYING, COSMIC CATASTROPHE, DINOSAURS, AND THE THEORY OF EVOLUTION AUTHOR: KENNETH...
