Question

why is coal called 'black gold'​

Answer 1

$\huge\mathfrak\purple{☆ANSWER☆}$

Coal is called black gold because it is black in colour and it is too costly .

hope it helps uh♡

Answer 2

Answer:

Petroleum is called black gold *

Explanation:

Petroleum is the lifeline of civilization. The economy of a nation depends to a great extent on its petroleum wealth. That is why petroleum is called black gold