| A | B |
|---|
| natural resources | materials in the environment that are useful to people |
| fossil fuels | a flammable material made from waste and remains of plants and animals in the Earth's crust that is used to produce heat and power |
| renewable resources | materials from the Earth that can be replaced by nature within a relatively short period of time; example: trees |
| nonrenewable resources | Materials from the Earth that cannot be replaced within a reasonable amount of time; for example, oil, coal, and natural gas |
| conservation | to protect and avoid wasteful and destructive use |
| reduce | make smaller or use less |
| recycle | save and remake into a new product |
| reuse | use again instead of throwing away |
| fuels | material burned to produce heat and energy |
