| A | B |
|---|
| mineral | a solid, formed in nature, that has never been alive |
| rock | a naturally formed solid made of one or more minerals |
| igneous rock | rock that was once melted and then cooled and hardened |
| sedimentary rock | rock that is formed from material that has settled into layers |
| metamorphic rock | rock that has been changed by temperature and pressure |
| fossil | a trace or the remains of a living thing that died a long time ago |
| imprint | marks, such as dinosaur tracks, that hardened in mud over time |
| mold | the shape of a once living thing left in sediment when the rock formed |
| cast | formed when mud or minerals later fill a mold |
| color, hardness, and streak | ways to identify minerals |
| granite and obsidian | examples of igneou rock |
| limestone and sandstone | examples of sedimentary rock |
| marble and gneiss | examples of metamorphic rock |
