Answer : One of the most important forms of energy is fossil fuels. It usually comes from the dead and decayed matter over decades under the ground. The forms of fossil fuels that we use in our lives are in the form of coal, petrol, diesel, natural gas, etc. we use the major fuel for transportation purpose is either coal or petrol, which is now being replaced by CNG (compressed natural gas). Coal is still used to generate electricity in many countries.
