| A | B |
| tidal energy | a form of hydroelectric energy produced form the difference between high tide and low tide |
| fusion energy | energy released when the nuclei of two atoms are forced together |
| hydroelectric energy | energy generated from the force of falling water |
| chemical bonds | the forces that join atoms to each other |
| nuclear energy | energy from splitting nuclei of atoms |
| geothermal energy | energy from heat inside the earth |
| solar energy | the energy of sunlight |
| biomass | energy from burning organic matter such as garbage |