The fossil shows a fish, in rock, on the hill.

Today, fish live in water. A fish cannot live on a dry hill.

The fish lived long ago, right here, where the rock is.

So we think this hill was once under water.

The fossil shows a fish, in rock on a hill. Fish live in water. So we think: this hill was once under water.

Now, did somebody carry the fish up here?

Nobody did. The fish is inside the rock, and the rock is part of the hill itself.

The rock formed around the fish, a very, very long time ago.

Nobody carried it up the hill.

The fish is inside the rock, and the rock is part of the hill. Nobody carried it up.

Places change over a very, very long time.

Long ago, the sea covered this hill. Today it does not.