| A | B |
|---|
| rock cycle | The process in which one type of rock changes into another type of rock |
| core | The center of the Earth |
| metamorphic rock | A rock that has been changed by heat and pressure |
| mantle | The middle layer of the Earth |
| sedimentary rock | A rock formed from material that has settled into layers and been squeezed until it hardens into rock |
| crust | The solid outside layer of the Earth |
| igneous rock | A rock that was once melted rock but has cooled and hardened |
| rock | A solid made of minerals |
| fossil | Something that has lasted from a living thing that died long ago |
| mineral | A solid natural object that has never been alive |
