| A | B |
|---|
| COMBUSTION | The burning of a fuel. |
| FOSSIL FUEL | An energy-rich substance (such as coal, oil, or natural gas) formed from the remains of organisms. |
| PETROLEUM | Liquid fossil fuel; oil. |
| NONRENEWABLE RESOURCES | A natural resource that is not replaced as it is used. |
| SOLAR ENERGY | Energy from the sun. |
| PASSIVE SOLAR SYSTEM | A method of converting solar energy into heat without pumps or fans. |
| ACTIVE SOLAR SYSTEM | A method of capturing the sun's energy and distributing it using pumps and fans. |
| HYDROELECTRIC POWER | Electricity produced by the kinetic energy of water moving over a waterfall or dam. |
| BIOMASS FUELS | Fuel made from things that once were alive. |
| GEOTHERMAL ENERGY | Heat energy in Earth's interior from water or steam that has been heated by magma. |
| NUCLEUS | The central core of an atom that contains the protons and neutrons. |
| NUCLEAR FISSION | The splitting of an atom's nucleus into smaller nuclei. |
| FUEL RODS | Uranium rod that undergoes fission in a nuclear reactor. |
| CONTROL RODS | Cadmium rod used in a nuclear reactor to absorb neutrons from fission. |
| MELTDOWN | A dangerous condition caused by overheating inside a nuclear reactor. |
| ENERGY CONSERVATION | The practice of reducing energy use. |
