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The theory is that volcanic activity became so widespread as to cause a severe buildup in gas, ash, and dust to accumulate in the atmosphere to the point that the sun's rays were eventually lessened to the point that temperatures plummeted, plant life died, and the dinosaur could not adapt to their new environment and gradually died off as a result. The physical evidence for this theory is very similar to that offering support for the collision theory and, as a result, many scientists split their opinion between the two theories.
There is body of evidence that supports the theory that the emergence of mammals on the earth contributed to the extinction of dinosaur. The appearance of mammals created an environment of competition that the dinosaur had not been forced to encounter before and when mammals began competing for the same food stuff and, more importantly, began seeking dinosaur's eggs the dinosaur were ill-equipped to compete.
It would be nice if the fossil records would support one of the above stated theories over the other but this is not the case. In certain areas of dinosaur discovery, fossil records indicate a sudden extinction as there is virtually no fossil records after a specified...
This divergence may indicate that the extinction occurred for various reasons throughout the areas occupied by dinosaur activity.
The final theory is based upon the idea of continental drift. This theory postulates that the earth's land masses were gradually changed by changes in oceanic activity and a shifting of the continental shelves. The result was that the dinosaurs were unable to adjust to the resulting changes in climate and gradually died off. The strongest evidence for this theory is that fact that ocean levels dropped off severely in the period surrounding the extinction of the dinosaur.
The likelihood is strong, based upon the physical evidence that is available, that a combination of factors led to the extinction of the dinosaur. As no one theory is able to categorically establish why dinosaur became extinct and the physical evidence lends credence to all present theories, the best bet is that portions of all suggested theories contributed and that eventually a new theory will be offered that more accurately explains the reasons. Until then, all available theories merit consideration.
Earth Science
African-Americans and Western Expansion Prior to the 1960s and 1970s, very little was written about black participation in Western expansion from the colonial period to the 19th Century, much less about black and Native American cooperation against slavery. This history was not so much forbidden or censored as never written at all, or simply ignored when it was written. In reality, blacks participated in all facets of Western expansion, from the
Christian Biotechnology: Not a Contradiction in Terms Presented with the idea of "Bioethics" most people in the scientific community today immediately get the impression of repressive, Luddite forces wishing to stifle research and advancement in the name of morality and God. Unfortunately, this stereotype too often holds true. If one looks over the many independent sites on the Internet regarding bioethics, reads popular magazines and publications, or browses library shelves for
Hisory of Palliatve Care Palliative Care Palliative Care Methods Palliative care entails assisting patients get through pain caused by different diseases. The patient may be ailing from any diseases, be it curable or untreatable. Even patient who are sick and almost passing away will need this care. Palliative care has characteristics that differentiate it to hospice care. The key role for palliative care is to help in improving the existence of someone and
Wile human beings have always exploited one another, and even looked down upon the so called "other," never before was it possible to claim as a matter of objective scientific fact, that other peoples were simply not "human" and thus could be treated as little more than farm animals. Of course looking back now, it is clear that these racialist theories were nothing more than pseudoscience, and justifications for
If however she had achieved the ideal non-attachment of Buddhism, her grief would still be real, but she would experience it in a different way. Her grief would be part of a process of letting go the son who is no longer there. A degree of non-attachment would then allow her to experience the grief as outside of herself rather than as part of her individuality. This would help
Prester John was another mythic king of another semi-mythic land (probably modern day Ethiopia) that was long sought by European explorers and adventurers. Once again, the very nature and purpose of Ponce de Leon's expedition emphasized the European view of the New World as a place where anything was possible - in particular, those things which were not readily possible back home. Untold wealth in precious metals went hand in