| A | B |
|---|
| FOSSIL | The preserved remains or traces of living things. |
| PALEONTOLOGIST | A scientist who studies fossils to learn about organisms that lived long ago. |
| SEDIMENTARY ROCK | A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together. |
| PETRIFIED FOSSIL | A fossil in which minerals replace all or part of an organism. |
| 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 formed when minerals seep into a mold. |
| TRACE FOSSIL | A type of fossil that provides evidence of the activity of ancient organisms. |
| EXTINCT | Describes a type of organism that no longer exists anywhere on Earth. |
| INDEX FOSSIL | Fossils of widely distributed organisms that lived during only one short period. |
| INVERTEBRATE | An animal without a backbone. |
| VERTEBRATE | An animal with a backbone. |
| MASS EXTINCTION | When many types of living things become extinct at the same time. |
| AMBER | Hardened tree sap which can preserve fossil insects |
| LA BREA | Asphalt pits in Los Angeles which contain fossils of Mastodons |
| PRETRIFICATION | Soft body tissue is slowly replaced with minerals |
| TROPITE | A type of ammonite fossil |
| PHACOP | A type of trilobite fossil |
| TRILOBITE | A group of fossils related to horse shoe crabs |
| ICE AGE | The last one occured 20,000 years ago |
| AMMONITE | A swirled fossil - looks like a nautilus |
| COPROLITE | Animal dung |
| WOOLY MAMMOTH | Ice age animal related to modern elephants |
| VOLCANO | Ash from this activity covered and preserved many organisms |
| MARINE FOSSIL | Fossil of an organism that lived in water |
