| A | B |
|---|
| natural resources | materials in the environment that are useful to people |
| fossil fuels | fuels formed form the decaying remains of plants that lived millions of years ago |
| renewable resources | natural resources that nature can produce again, such as trees, plants, animals, water, oxygen, and soil |
| nonrenewable resources | natural resources, such as fossil fuels, that will eventually be used up and can never be replaced |
| alternative energy sources | sources of energy that do not come from fossil fuels |
| geothermal energy | heat energy naturally produced within Earth |
| hydroelectric power | electricity made from the energy of moving water in a dam |
| conservation | the practice of decreasing the use of natural resources in order to save them |
| biofuels | fuels made from organic matter |
| plants | a living organism that uses sunlight to make its own food |
| recycle | save and remake into a new product |
| reduce | make smaller or use less of |
| reuse | use again instead of throwing away |
| wind energy | energy that comes from changing the power of moving air into a useful form |
| pollution | matrials introduced into an environment that cause damage, discomfort, or instability |
| solar energy | energy that comes from the sun |
