Why did dinosaurs become extinct?

The reasons for the extinction of dinosaurs are as follows:

1, crustal movement. With the changes of the earth's times, there will be crustal movement on the land, leading to the extinction of dinosaurs.

2. Climatic reasons. Acid rain led to the extinction of dinosaurs. There may have been strong acid rain at the end of Cretaceous, which dissolved trace elements including strontium in the soil and made dinosaurs unable to survive.

3. Volcanic eruption led to the extinction of dinosaurs without living environment.