Extinction Of Dinosaurs
Extinction of Dinosaurs
Two-hundred and thirty million years ago the first dinosaur-like creature roamed the earth. Dinosaurs were a very successful and diverse group, dominating the terrestrial environments of the earth for 160 million years. The apparently sudden mass extinction of dinosaurs marks the boundary between the Cretaceous and Tertiary periods. Though there is not one definitive explanation to explain dinosaurs' extinction, there are various theories that attempt to account for the mystery of their extinction. The theories that explain their extinction at the end of the Cretaceous period are the asteroid, the volcanoes, and the major climatic changes.
The most popular "disaster theory" for the extinction of the dinosaurs is that the Earth was hit by an asteroid or a comet 65 million years ago. The impact was proposed by a Professor of geology from Berkeley, California, Walter Alvarez. Alvarez's conclusion about the extinction was "A giant meteor had struck down the......
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