| A | B |
|---|
| Alternative Energy Sources | Energy generated by natural processes that is renewable. |
| Biofuels | Fuel made from plants, animal wastes, and decomposing plant and animal tissue (organic material) |
| Geothermal Energy | Energy that comes from the natural heat inside the Earth |
| Solar Energy | Energy that comes from the sun |
| Hydroelectric Power | Electricity made from the energy of moving or falling water |
| Wind Energy | Energy that comes from changing the power of moving air into a useful form |
| Pollution | Materials introduced into an environment that cause damage, discomfort or instability. |
| Renewable Resources | materials from the Earth that can be replaced by nature within a relatively short period of time; example: trees |
