Read the following passage and make notes by drawing and filling the boxes given below:
Energy is the primary input in the production of goods and services. The wheels of progress move with the flow of energy. On the basis of their nature, the sources of energy are of two types: conventional and non-conventional. Coal, petroleum, natural gas and electricity are the conventional energy sources. These are limited and exhaustible in nature. The sun, wind, tides, geothermal energy and bio-gas are the sources of non-conventional energy. These sources are renewable in nature.
