The chronicle in rock is read by scientists called paleontologists. They go to far off place in the mountains and deserts, where the ancient pages have come to earth’s surface. It is a difficult task to read these pages. They are often cracked or faded, or the bones of animals are mixed up, or the imprints of the shells, plants and insects been swept away.

Paleontologists can tell a lot about an animal from just one bone. They put together the bones they find and learn about the animal’s shape, where it lived and what it could do.

But everyone can’t read these rock pages.

The Paleontologists have told us what the earth looked like before human beings arrived, what animals and plants lived in the seas and on the and. They have read the chronicle in rock to as far back as 3,000 million years ago when life first had appeared in the warm waters of the ocean.