| A | B |
|---|
| mineral | a naturally occuring substance that is neither plant nor animal |
| relative age | the age of something compared with the age of another thing |
| cast | formed or shaped within a mold |
| metamorphic rock | rock that has been changed by heat, by pressure, or by both |
| amber | hardened tree sap, often a source of insect fossils |
| rock cycle | a process by which rocks are changed from one type into another |
| sedimentary rock | rock formed when bits or layers of rocks are cemented together |
| imprint | a fossil created by a print or impression |
| mold | a hollow fossil form clearly showing the outside features of the organism |
| igneous rock | fire-made rock formed from hot, molten rock material |
