3.ENERGY SOURCES: 
Energy sources are natural resources that we can use to generate different forms of energy.Then we can transform that energy for various purposes.

 











3.1 NON-RENEWABLE ENERGY SOURCES:
They include fossil fuels and nuclear energy,which uses radioactive materials,such as uranium.

COAL.







3.2 RENEWABLE ENERGY SOURCES: 
Renewable energy sources come from natural resources that we cannot use up completely.These include hydroelectric,solar,marine,geothermal and biomass resources,as well as energy that we can produce from solid urban waste.