Extinction of Dinosaurs

    Approximately 65 millions years ago earth was occupied by the dinosaurs. The word dinosaur is a word of greek language, which means terrible lizard. There were several species of dinosaurs like Plateosaurus engelhardti , Allosaurus fragillis , Barosaurus lentus etc. They had been living on earth for 165 million years. That era of the Dinosaurs was known as the Mesozoic era. But these monstrous animals did not able to fight with the biggest natural disaster on earth. According to the scientists 66 million year ago an asteroid hit earth, due to this the whole environment of earth had been changed. Due to that impact the atmosphere covered with dust, so the sunlight was not able to reach to the surface. Volcanic eruption occurred spontaneously, the level of sea also changes. So that changing environment became uncomfortable for the dinosaurs and the massive extinction occurred. The flying species Pterosaurs escaped from the initial impact because of their flying capability but afterward they were also affected. The debris were falling from the sky like fireballs and it burnt the prerosaurs.At that time the mammals were saved because of their small size and the lived underground. Most of the population on earth were destroyed and they became extinct.  After a long period of time when the environment started to become normal all the mammals came out from their underground holes and started their population. Due to the Dinosaurs the mammals were not able to walk through the ground spontaneously. But when the dinosaurs were gone the mammals became so spontaneous and they started to evolve. This mass extinction was one of the largest natural disaster ever happened to the Earth.Not only the animals the plants were also affected due to that asteroid impact. Approximately 75% of the population on earth were destroyed. Through out the world there are many fossils of dinosaurs are being discovered . On the basis of these fossils the scientists have gathered information about the species which have been extinct. The scientists are still doing their research to find out what actually happened.  There are several museums in the world where the fossils of the dinosaurs are being preserved and display to the visitors.