ENERGY SOURCES

Energy sources are natural resources that we can use to generate different forms of energy. Then we can transform that in energy for various purposes.
We can classify into two general categories:

- Non-renewable energy sources.
Come from natural resources that are limitated and can be exhausted. Are the most commonly used. They include fossil fuels (oil, coal and natural gas), and nuclear energy, which uses radioactive materials.

- Renowable energy sources.
Come from natural resources that we cannot use up completely. These include solar, marine, hydroelectric, geothermal and biomass.