| Term | Definition |
| fossil fuels | nonrenewable energy resourses, such as oil, natural gas, and coal, that are formed from the decayed remains of ancient plants and animals: can be burned to supply energy and generate electricity |
| petroleum | crued oil- a highly flammable fossil fuel formed from decayed remains of ancient organisms: contains hydrocarbons and can be refined into fuels and used to make plastics |
| nonrenewable resources | any natural resources, such as all fossil fuels, that cannot be replaced by natural process as quickly as they are used |