| A | B |
|---|
| natural resources | resources that come from nature |
| renewable resources | resources that can be used again and again |
| nonrenewable resources | resources that are being used faster than they can be replaced |
| conserve | only use what you need, save |
| reduce | use less of something |
| reuse | use again |
| recycle | turn into something else instead of throwing away |
| pollution | harmful material that enters the environment |
| composting | throwing food waste into a special trash can so it turns into fertilizer (good to grow plants in) |
| conservation | smart use of natural resources to prevent them from being used up |
| biodiversity | total variety of living things in an environment |
| extinct | plants and animals that no longer live on Earth |
| endangered | organisms in danger of becoming extinct |
| threatened | may become extinct in the future but are not close to extinction yet |
| deforestation | cutting and clearing of forests |
| wildlife refuge | large area of land where many different organisms can be protected from hunting, human activity, and loss of habitat |
| alternative energy resources | solar energy, wind energy, geothermal energy, hydroelectric energy, and nuclear energy |
| fossil fuels | coal, oil, and gas - used for heating homes and electricity, pollute the atmosphere |
| geothermal energy | heat in Earth's crust |
| solar energy | energy from the Sun |
| hydroelectric energy | the energy of moving water |
| wind energy | the energy in wind |
