Natural resources should be used

 Inexhaustible resources are also known as

 Exhaustible resources are available in

Which one of the following resource is used to run steam engines and factories?

Which is most important for the growth of a plant?

Which one of the following is popularly known as black gold?

The top layer of the earth's surface in which plants grow is

Which one of the following is refined to produce petrol and diesel?

Which is extensively used for street lighting?

Plants are also known as