| Term | Definition |
|---|
| mineral | a naturally occurring substance, neither a plant nor animal |
| igneous rock | "Fire-made" rock formed from melted rock material |
| sedimentary rock | rock formed from bits or layers of rocks cemented together |
| relative age | the age of something compared to the age of another thing |
| metamorphic rock | rock whose form has been changed by heat and/or pressure |
| rock cycle | a never-ending process by which rocks are changed from one type to another |
| imprint | a fossil created by a print or an impression |
| mold | a type of fossil that is a hollow form with a particular shape |
| cast | a fossil formed or shaped within a mold |
| amber | hardened tree sap, yellow to brown in color, often a source of insect fossils |
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