| A | B |
| heat | transfer of thermal energy from one substance to another |
| solar energy | the energy of sunlight |
| hydroelectric energy | electricity generated from the force of moving water |
| tidal energy | a form of hydroelectric energy that produces electricity from the rising and falling of tides |
| nuclear energy | the energy released when the nucleus of an atom is split apart |
| biomass | organic matter such as wood that is living or was recently alive |
| fusion energy | the energy released when the nuclei of two atoms are forced together to form a large nucleus |
| convection | the transfer of heat as a result of the mixing of a liquid or a gas |
| chemical bonds | the forces that join atoms to eachother |