| 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 forms from materials that has settled into layers and then are squeezed together |
| 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 |
| decompose | to rot away |
| crust | the outside layer of the earth |
| mantle | the middle layer of the earth where rocks are melted. The crust sits on it. |
| inner core | the solid, middle of the earth |
| outer core | the hot, liquid middle of the earth. It is under the mantle. |
