| A | B |
|---|
| paleontologist | A scientist who studies fossils to learn how organisms lived long ago. |
| scientific theory | A well tested concept that explains a wide range of observations. |
| evolution | The process by which living things have changed over time. |
| mold | A fossil formed when an organism buried in sediment dissolves, leaving a hollow area. |
| cast | A fossil that is a copy of an organism's shape. |
| fossils | preserved reamins or traces of living things |
| sedimentary rock | the type of rock MOST fossils are found |
| petrified fossils | fossils in which minerals replace all or part of an organism |
| trace fossils | provide evidence of the activities of an ancient organism |
| preserved remains | a fossil in which an organism gets trapped in tar, ice, or amber |
| carbon films | an extremely thin coating of carbon on rock |
