the advancement of Technology and invention of machines resulted in the increase demand of coal and petroleum justify.( for class 5)
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The demand for energy across the world is constantly rising. This increased demand is caused in part by the increase in population, and by economic development. ... It is because these areas experienced large-scale economic development, there original energy sources were fossil fuels – first coal and the petroleum.
petroleum has been demanded on large scale for it's components like nepthela, fuel oil, kersene, petrol, diesel and so many .
coal is demanded for termal energy, electricity and coal tar, coal gas and coke
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