Which of the following is a "conventional" (traditional) source of energy As per your syllabus, ?

1. syllabus classifies energy sources into conventional and non-conventional. 2. Conventional: firewood, cattle dung, coal, petroleum, natural gas and electricity (hydro/thermal). 3. Non-conventional: solar, wind, tidal, geothermal, biogas, atomic (nuclear). 4. So coal is a conventional energy source. _Source: syllabus Social Science (Geography), Ch 5 "Minerals and Energy Resources", §5.3_