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¶ … Dinosaurs Became Extinct
Why Dinosaurs Became Extinct
There are many possible explanations for the extinction of dinosaurs, and scientists have proposed many theories regarding their demise. One of the most common theories is that an asteroid from outer space collided with the earth about 65 million years ago. If a large asteroid had collided with the earth in this manner, then it is believed that such a cloud of dust would have entered the air that the sunlight would be unable to penetrate the dust cloud.
Therefore, all of the plants and animals would die, because the entire ecosystem on earth depends on the sunlight to provide warmth and energy. Without the sun, plants would be unable to produce their own food through photosynthesis, and they would die. Without plants, the herbivores would have no food supply and also perish. As a result, even the carnivores that ate other animals would have no food, as all of their food sources would disappear. (It is also believed that excessive volcanic activity may have caused a similar dust cloud that would have resulted in planetary changes very much like those described in the asteroid theory.)
It is also believed that under a thick dust cloud it would become very cold without any penetrating sunlight, which could have even resulted in an ice age, where a large portion of the water on earth would have been frozen and the atmosphere changed drastically. Therefore, it is also possible that all of the dinosaurs could have perished due to an ice age or similar atmospheric change. Another theory is that the dinosaurs became extinct when the earth gradually changed atmospheric conditions. If the earth had changed from being extremely warm and humid to being colder and less wet, then the dinosaurs may not have been able to adapt to the new earth climate and therefore died out. Gradual changes in the climate or many other factors may also have brought serious disease to the dinosaurs. If a plague-like illness circulated among the dinosaurs, then this could be another explanation for their disappearance because they would have had no medical knowledge such as humans posses today with which to combat the disease.
Dinosaur Extinction: Currents Theories and Explanations Mass extinctions of plants and animals have occurred many times in the history of the earth, one of the most widely known being that of the dinosaur over 65 million years ago. Many theories as to why the dinosaurs became extinct exist, including volcanic eruptions, changes in climate, diseases, radiation form a nearby supernova, and giant meteor and/or comet impacts. Although loyal believers back all
Contrary to what one would expect if the extinction were gradual, the existing history of fossil records indicates that dinosaur were doing quite well up and that there were no factors threatening their extinction but that suddenly there is a complete loss of fossil history; a sudden extinction? The collision theory is likely the most popular of the available approaches but there are several others including one that involves the
This occurred in 330 BC, and Zoroaster's date would then be 588 BC, and this date we may take to refer to the initial success of his prophetic mission which consisted in the conversion of King Visht-spa when Zoroaster was forty years old. Since he is traditionally said to have lived seventy-seven years, we will not be far wrong in dating him at 628-551 BC. It seems also to
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