| A | B |
|---|
| fossil fuel | a fuel formed from the remains of ancient forms of life |
| igneous rock | Rock formed when melted rock materials cools and hardens |
| metamorphic rock | Rock changed by extreme heat and pressure |
| mineral | A solid material that is part of earth's crust and has a defined chemical structure. |
| sedimentary rock | Rock made of bits of rock joined together |
| soil | Mixture of tiny rock particles |
