why is coal often referred to 'black gold' ?
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Coal is called black gold because it is black in color and costly too.
It is used in wide range of industrial applications and creates a positive impact on the economic development of the country. Thus, it's value is compared with that of gold.
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➡️Coal is in black colour and it gets from earth crust. As it is black colour so we called it as black gold. It is expensive too. Like this gold is in golden colour so we call it as gold this too get from earth's crust.
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