| A | B |
|---|
| crust | The layer of rack that forms Earth’s outer surface |
| Mantle | The layer of hot, solid material between Earth’s crust and core |
| Inner/outer core | The dense sphere of solid iron and nickel at the center of the Earth and the molten surrounding the inner core. |
| mineral | A naturally occurring solid that can form by inorganic processes and that has a crystal structure and a definite chemical composition |
| crystal | A solid in which the atoms are arranged in a pattern that repeats again and again. |
| Igneous rock | A type of rock that forms from the cooling of molten rock at or below Earth’s surface |
| sediment | Small, solid pieces of material that come from rocks or the remains of organisms deposited by erosion |
| sedimentary rock | A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together |
| metamorphic rock | A type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions |
| rock cycle | A series of processes on the surface and inside Earth that changes rocks from one kind to another |
