| A | B |
|---|
| non-renewable resource | a resource that cannot be replaced after it is used |
| fossil fuel | a fuel that is formed over many years from the remains of living organisms |
| solar energy | a sustainable energy that comes from the sun and can be collected in many ways |
| sustainable energy | an energy source that can be continually used and will not run out |
| wind energy | a sustainable energy from the wind collected from wind turbines |
| tidal energy | energy collected moving water from tides, rivers, and open ocean currents |
| geothermal energy | energy used from inside the earth |
| hydroelectricity | electricity generated from controlling water by using a dam |
| hydrogen | a fuel that can be made by splitting hydrogen atoms from water |
| renewable resource | a resource that can be replaced within a reasonably short time |
| biomass | burning of carbons such as corn or soy grown to make ethanol fuel |
