Fossils have proved that the dinosaurs roamed many different parts of the Earth at the same time. They survived for hundreds of millions of years on the Earth. One of the great mysteries of the dinosaurs surrounds their extinction. Most dinosaurs finally became extinct about 65 million years ago during the Late Cretaceous period. There have been various theories which have attempted to explain the mystery of their extinction.
Some scientists argue over the term and actual concept of the extinction of the dinosaur.
There is some debate over the use of the term 'extinction of dinosaurs' as birds are dinosaurs and have survived the apparent extinction to become a vital and prominent species in modern-day society. But, this theory is inaccurate and unscientific. Dinosaurs were well adapted to their earthly surroundings. Another theory centers around the extra-terrestrial causes for the extinction of the dinosaurs. Some believe large meteorite impacts produced great dust clouds causing mass extinction.