Which of the following is not commercial source of energy?
A. Coal
B. Petroleum
C. Natural Gas
D. Firewood
Answer: Option D
Solution (By Examveda Team)
Commercial source of energy such as coal, petroleum & natural gas are obtained commercially whereas fire wood is obtained non-commercially by people from wastelands forestlands in terms of twigs, sticks etc.This Question Belongs to Geography >> Natural Resources And Industries In Indian Geography
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