Dinosaurs: a very large animals that lived before the birth of man on Earth and lived for a 160 million years as scientists, were very large animals, including what is called live fire from his mouth. Vanished dinosaurs of all kinds, about 65 million years ago, scientists were unable to determine the cause of extinction, but the most likely cause was a collision with another asteroid planet, which led to the death of all the dinosaurs of all kinds, and was likely another team of scientists, the extinction of the dinosaurs to the occurrence of earthquakes and volcanoes continued for nearly a million and a half years on Earth as a result of climate change, which adzei to the end of life on Earth for all living organisms. Scientists called the Cretaceous extinctions, scientists found that there are some organisms that survived this extinction, scientists have outweighed the small creeping animals are spared, since their small size commensurate with any climatic envelope to live, while big and bulky is extinct, It has survived nearly more than 80 turtles and reptiles and small lizards managed to escape. In modern times the scientists found bones belonging to a dinosaur in the San Juan basin, and this made scientists before the first options is the possibility that some types of dinosaurs lived for 5000 years after the extinction, or that these bones belonged to a dinosaur before extinction, but the stronger weighting is that some dinosaurs were able to escape after the extinction. The first theory scholars tended to cause extinction is continental drift: the scientists proved that the Earth was a single large continent called Pangea, and then updated several divisions on the continent to consist of seven continents, when continental drift became continents approaching to the North and South poles, which led to the escape of dinosaurs from North and South toward the equator, warm areas more suitable for living dinosaurs from the polar regions, but this error occurs the theory that continental drift was not The reason that dinosaurs moved towards the equator, so life continued, and that extinction came after continental drift. Theory 2: the spread of poisonous plants in the late Cretaceous period, and that the dinosaurs suffered poisoning as a result of ingesting these plants leading to extinction. The third theory: extinction was an epidemic caused the death of all the dinosaurs in the Cretaceous, but the epidemic cannot be long kind of dinosaurs at the expense of another. Fourth theory: was that dinosaurs had begun to extinction as a result of collision with another asteroid planet, was partial and gradual extinction, but with climate change began and volcanoes in Western India, which led to the end of life for rodents. Differences remained among scientists for the extinction of dinosaurs, but remained most views combined on volcanoes that hit Earth, and earth asteroid collision last.

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