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Dinosaurs are the extinct animals that inhabited our planet 225-65 million years ago (during mesozoans period).

In ancient times people considered these bones to be the remains of the heroes of the Trojan War. During medieval times and till the 19th century these bones were considered to be the remains of giants that were mentioned in the Bible and that died during the Deluge.

According to the recent investigations from the USA Universities, dinosaurs the remains of which palaeontologists find died because of suffocation.

Dinosaurs became extinct in the end of Cretaceous period near 65 million years ago. There is no one point of view on the reason for their extinction, scientists are not even sure either they died out gradually or suddenly. This point is the point of discussions nowadays.

These animals are rather popular all over the world till nowadays despite the fact they are extinct. Nevertheless these animals are popular characters of cartoons, myths, legends and films that become rather popular.

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Geographical and climatic theories

There are a lot of scientists that consider that the extinction of dinosaurs was connected with the space that brought the catastrophe to our planet. But there are some scientists that consider other reasons to be guilty in dinosaurs dieing. And here are some of them.

The increase of volcano activity could be the reason for dinosaurs' extinction. The increase of volcano activity could influence the chain of events that could influence the atmosphere such as the emission of the carbon dioxide during the eruption, the change of the Earth's lighting because of the volcano dust that was released during the eruption. And the great release of magma about 60-68 million years ago on the territory of Hindustan proves this theory.

Another theory was the decrease of the sea level that took place during the last phase of the Cretaceous period. This happened suddenly that is the proof that the extinction of dinosaurs was also sudden.

There is also the theory about the change of the average and season temperatures. But the dinosaurs' organisms needed the regular temperature.

The repent change of the magnetic field of Earth, the plenty of oxygen in the atmosphere, the sudden coldness of the ocean, and the change of the maritime structure of water are also among the theories that try to explain the reason of dinosaurs' extinction.

Nevertheless there is no universal theory and different scientists support different theories.