The last dinosaurs walked this earth over 65 million years ago. Although the cause of extinction is still a mystery. There are many leading theories why A big meteorite crashed into Earth, changing the climatic conditions so dramatically that dinosaurs could not survive,Ash and gas spewing from volcanoes suffocated many of the dinosaurs,diseases wiped out entire populations of dinosaurs food chain imbalances lead to the starvation of the dinosaurs.Why there are so much reasons and no one has decided which one has killed the dinosaurs is because each scientist has his or her theory of why the dinosaurs went extinct.. The main topics i’m going to write about is the theory of the asteroid hitting the earth and changing the climate another topic i’m going to write about is the volcanoes exploding and how the asteroid hit and set off the volcans. The theory of a asteroid extincting dinosaurs was a theory created by A group of 41 researchers led by father and son researchers Luis and Walter Alvarez. There reasoning for believing that the asteroid hit the earth and killed the dinosaurs is because there was a rock layer of iridium in earth layers about the time the dinosaurs went extinct.They had published their findings of the rock layer in 1981.Then about 10 year later a massive meteor was found in yucatan peninsula the meteor was about 110 miles in diameter and it hit the earth 40,000 miles per hour released 2 million times more energy than the most powerful nuclear bomb ever detonated. The theory of volcanoes extincting dinosaurs the was created by a group of researchers.There reasoning for thinking dinosaurs went extinct by volcanos are that there was a volcano layers about the time the dinosaurs went extinct the layers covered 200,000 square miles of western india.. Keller has come up with the idea that the asteroid impact happened earlier than the die-off and couldn’t have been the reason the dinosaurs died off because . Her work has been controversial, and she has long been viewed as a maverick in the scientific community. The theory that the asteroid hit the earth and set the volcanos off .was created by uc berkeley team . There reasoning for believing that their theories killed the dinosaurs is because the evidence from both android and volcano had proved the asteroid did not act alone.Growing evidence points to a volcano that could of gone off when the asteroid hit . Eruptions in what is now India spewed out molten rock and caustic gases .This could have destabilized ecosystems long before and after the asteroid hit. The jolt of that impact may even have boosted the eruptions. Thought the scientist and researchers have not exactly figured out how the dinosaurs went extinct there are many opinions on how they went extinct so it’s your opinion that decides how their species died whether you think volcanoes killed the dinosaurs or the asteroids or you have a total different opinion.