29. NCERT Exemplar XXII

 

 

If all the exhaustible chemical resourcesnatural resourceswild resourcesman-made resources are exhausted by human activities, then the survival of living beings would not be possible. Actually, fossil fuelsliquid fuelssolid fuelsgas fuels are the essential energy source for us today. They are a concentrated energy source and give off heat and light on burningheat and light on formingheat and gas on burninggas and light on burning. The heat can be used to cook foodcook cakecook cheesecook rice or run engines such as automobile engines. It can be used to generate electricity, as in powerhouses where coalcharcoalcoal gascoal tar is the most common fuel.