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| Term | Definition |
|---|---|
| amber | Hardened tree sap yellow to brown in color that can be a source of insect fossils |
| mold | An empty space in rock that once held the remains of a living thing |
| cast | A fossil formed or shaped within a mold |
| imprint | A fossil made by an impression |
| fossil fuel | A source of energy made from the remains of ancient once-living things |
| nonrenewable resourse | A natural material or source of energy that is useful to people and cannot be replaced easily |
| fossil | any evidence of an organism that lived in the past |
| renewable resourse | A useful material that is replaced quickly in nature |