| A | B |
|---|
| oil reserves | Oil that has been discovered but remains unused in the ground |
| natural gas | gas found beneath earth's crust that can be burned as fuel for cooking, heating homes, and other purposes |
| crude oil | petroleum as it comes out of the ground and before it has been refined or processed into useful products |
| nonrenewable resource | a resource that takes so long to form that it can't be replaced. |
| example of a nonrenewable resource | oil |
| renewable resource | a resource that can't be used up or that can be replaced as quickly as it is used up |
| examples of renewable resources | Sunlight, wood |
| impermeable rock | rock that does not allow liquid or gas to flow through it |
