Fossil fuel are energy sources such as coal and petroleum obtained from underneath of earth’* crust they are directly available to human being for use hence fossil fuels are the direct source of energy these are limited in amount these are non renewable sources of energy because three cannot be replenished in nature fossil fuel-take million of years for their formation.
If the present fossil fuel of the earth gets exhausted its formations will take several years, fossil fulls are also very costly. On the other hand solar energy is a renewable and direct source of energy and will do so for the next five billion years, solar energy is available free of cost to all in unlimited amount replenishes in the sun itself.
