____________is a examples of gaseous fuels.

It is Solid Fuels,like LPG,CNG,PNG and Biogas,that are used commonly used as Domestic Fuels.

Also CNG is a better ________ Fuel.

Electricity,generated by using the energy of water,is called ________ .

_____ is a combustible black Sedimentary rock.

Petroleum is also know as ___________ .

Aeroplanes commonly use a highly refined kerosene based fuel known as _______________ .

There are ____ Main Fossil Fuels .

Fossil Fuels are also the ______ cause of pollution.