| A | B |
|---|
| Amount of carbon in a lignite | 70% |
| The most common fossil fuel | coal |
| Fossil fuel that formed when microorganisms died and fell to the bottom of seas. | petroleum |
| First stage of coal formation. | peat |
| SOft brown rock that forms as layers of sand and mud covered peat. | lignite |
| Mostly methane, usually found with petroleum. | natural gas |
| Source of energy in fossil fuels. | sun |
| Third stage of coal formation. | bitumen |
| Chemicals made from petroleum. | petrochemicals |
| Kind of rock in which fossil fuels are found. | sedimentary |
| Layers of coal. | seams |
| Fourth of stage of coal formation. | anthracite |
| This is where peat can be found. | swamps |
