| Term | Definition |
| geothermal energy | energy created by hot water from the earth |
| nuclear fission | splitting of atoms nucleus into smaller particles |
| gasahol | mixture of gas and alcohol |
| nuclear fusion | combining of two atomic nuclei into a single large nucleus |
| biomass fuel | fuel made from plants or animals that were alive |
| insulation | building material that blocks heat transfer between inside and outside air |
| meltdown | condition caused by an overheating nuclear reactor |
| energy conversion | reducing energy use |
| hydrocarbon | energy rich chemical compound with C and H in it |
| nonrenewable resources | natural resource that can not be used again |
| petroleum | liquid fossil fuel, oil NR |
| renewable resources | natural resource that can be replaced |
| refinery | factory where crude oil is separated into fuel types |
| solar energy | energy from the sun |
| petrochemicals | compound made from oil |
| hydroelectric power | power from falling water KE |