How long did dinosaurs live on the earth?

Dinosaur is an animal that once lived on the earth. We have seen its horrible appearance in picture books and movies. So, when did dinosaurs live? According to the research of scientists, dinosaurs lived on the earth about 230 million years ago, and they didn't become extinct on the earth until 65 million years ago. They actually propagated on the earth for about 654.38+65 billion years. This is really an amazing number. Scientists have verified that we humans have existed on the earth for about 3 million years, compared with dinosaurs. It's only 1/55 of their time on earth. The earliest age of dinosaurs was called Triassic (205 million years ago ~ 65438+45 million years ago). The Triassic weather was quite hot and dry. At that time, reptiles ruled the earth. In the middle Triassic, dinosaurs appeared. There are many kinds of dinosaurs, among which the earliest dinosaur is Cong. There are many kinds of dinosaurs, such as Lufenglong, Yunnan Dragon, Iguanodon, Liang Long, Stegosaurus, Allosaurus and so on. In Jurassic, the weather was not as dry as Triassic, and there was more rain. Many dinosaurs lived in lakes and swamps. Their bodies are also very big, usually as heavy as four or five elephants. By Cretaceous (65.438+0.45 billion years), the land was divided into many plates, forming oceans and land, and volcanoes on the land often erupted. Brachiosaurus, Triceratops, Diptera, Duckbilled Dragon, Tyrannosaurus Rex and Ceratosaurus appeared in this period. At the end of Cretaceous, dinosaurs became extinct. They mysteriously disappeared.