কালো সোনা কি ? কালো সোনা কি ?

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asked Mar 2 by admin (26.7k points)

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answered Mar 2 by admin (26.7k points)

কালো সোনা হল কালো রঙ্গের বালুর মতো মূল্যবান খনিজ পদার্থ ।

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