What killed the dinos

well if you look in um i think Mexico there a large crater two none areas on earth are the strikepoints were the asteroids hit the earth but they were a few moments apart possibly years and the first one was the one that threw debris into the atmophere blocked solarphoto{sunlight} and that was waht killed the plants which most dinosaurs need to survive but then a few years later, another asteroid struck an note around this time the dinosaurs were alreaddy on the brink of dieing out and when it that asteroid struck it killed them