| A | B |
|---|
| natural gas | a fossil fuel gs that is burned for energy |
| nuclear fuel | an energy source made from unstable elements such as uranium |
| geothermal energy | energy created by pressure and heat under the Earth's crust |
| hydropower | energy from the movement of water |
| greenhouse gas | gas that makes the atmosphere able to hold more heat |
| fossil fuel | substance produced by pressure and decaying organisms used for energy |
| generator | device that changes the energy of motion into electrical energy |
| battery | device that stores chemical energy that can change into electrical energy |
| petroleum | liquid fossil fuel that can be burned to transfer energy |
| fuel | substance that releases energy when it burns |
