| A | B |
|---|
| geothermal | heat from within the earth |
| wind | air in motion; occurs due to unequal heating of the earth's surface; machines collect it's kinetic energy |
| solar | sun's rays changed to heat and electricity |
| nonrenewable energy sources | comes out of the ground but cannot be replenished |
| renewable energy sources | can be replenished in a short period of time |
| biomass | organic material made from plants and animals |
| hydropower | uses water to turn turbines to make electricity |
| ethanol | transportation fuel made from corn |
| biodiesel | made from left-over food products (oil and fats) |
| biogas (methane) | fuel made from rotting garbage or manure |
| work | force times distance |
| energy | the ability to do work |
