"Black gold is an oil; Black diamond is coal". Both are fossil fuels, but "black diamond" is a nickname for coal because it is a valuable, dark-colored resource used for power, just as "black gold" is a nickname for petroleum.
Black gold is an oil; Black diamond is ______?
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This question is part of 📚 General Knowledge within the broader 🌐 Current Affairs & GK subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.