Many theories exist that attempt to explain why the dinosaurs became extinct.
Evidence suggests that a meteorite crashed into the earth's surface. Evidence of a meteorite is found in the layers of earth of the Mesozoic Era. This layer of earth contains Uridium, an element found in meteorites but not naturally on earth. Dinosaurs existed during a time when all the continents were connected in one mass, called Pangea. As the continents split, the dinosaurs became seperated from eachother.