| A | B |
|---|
| Mineral | a naturally occurring 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 both |
| amber | hardened tree sap often a source of insect fossils |
| rock cycle | a process by which rocks are changed form one type to 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 of an organism |
| igneous rock | fire made rock formed from how molten material |
