The first dinosaurs appeared about 210 million years ago at the end of what is known as the Triassic Period. They roamed the Earth throughout the Jurassic Period until 64 million years ago, right at the end of the Cretaceous Period.
During the millions of years of life on Earth, the world has changed enormously : continents have moved , sea levels have altered , climates have changed , creatures have become extinct. If we look at fossils of creatures that lived before, during , and after the dinosaur age , we can see how some things have changed , and some have remained much the same
During the millions of years of life on Earth, the world has changed enormously : continents have moved , sea levels have altered , climates have changed , creatures have become extinct. If we look at fossils of creatures that lived before, during , and after the dinosaur age , we can see how some things have changed , and some have remained much the same