| Term | Definition |
|---|
| natural resources | Any of the useful minerals and other materials that people take from the Earth |
| nonrenewable resource | A resource that cannot be replaced once it is used up |
| renewable resource | a resource that is replaced as it is used |
| reusable resource | a natural resource that can be used more than once, reusable resources are sometimes called inexhaustible resources. |
| fossil fuels | a fuel formed from the remains of once-living organisms(nonrenewable resources) ex. coal natural gas, and petroleum |
| natural gas | a gas, usually called methane, usually found with petroleum (it is a fossil fuel/nonrenewable resource) |
| peat | a soft brown material made up of partly decayed plants. It forms as dead plants build up in swamps. This is the first stage of coal formation |
| Lignite | soft brown rock. It forms as layers of sand and mud cover peat. As the layers build up, the pressure of their weight squeezes moisture out of the peat, turning it into this soft rock. 2nd stage of coal develpment |
| bitumen | a fairly hard, dark brown or black rock. Millions of years of heat and the weight of even more layers of sediment turn lignite into bitumen. (3rd stage of coal development/most common type of coal mined today |
| anthracite | 4th stage of coal development. a hard, black rock. It is almost pure carbon |
| recycling | the process of taking back a resource used to make a product. That resource is then made into a new product. |
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