| A | B |
|---|
| What is left of a living thing from the past? | fossil |
| When a living thing has died out. | extinct |
| Scientists can put together a full set of bones from one animal to make this. | skeleton |
| What is a scientist who studies fossils called? | paleontologist |
| Plant and animal fossils found in the same layer of rock. | They lived about the same time. |
| Some became extinct because | there were big changes on Earth. |
| Millions of years ago, some California animals were trapped in | tar pits. |
| A dinosaur skeleton is made up of | bones. |
| Petrified wood is | fossilized wood that has turned into stone. |
| What is the first step of how a fossil is formed? | The animal dies. |
| What is the second step of how a fossil is formed? | Its body is covered by mud. |
| What is the third step of how a fossil is formed? | The animal's skeleton hardens in the layers of rock. |
| If paleontologists find many leaf fossils in a desert area, what can they guess about the past? | There once was plenty of water for plants to grow there. |
| What can a paleontologist learn from a dinosaur skeleton? | The size of the dinosaur. |
| A paleontologist who finds a fish fossil might guess that the area | used to be covered by water. |
| Can a hat, tooth, shoe, or a letter become a fossil? | tooth |
| An animal that is extinct is | gone forever. |
| What can you guess about a dinosaur skeleton with long sharp teeth? | It ate meat. |
| Some fossils are bones but other are | prints of whole animals or plants. |
| Scientists find fossils in | rock, ice, amber, and tar. |
