A) Precious minerals like gold and platinum are used for making jewellery.
B) Dentists use powdered pumice for polishing our teeth.
C) Black gold is another name of slate.
D) Shale is used to make tiles and bricks.
Correct Answer: C
Solution :
Black gold is a term applied to coal, crude oil or petroleum which are black in colour when they come out of the ground and are worth a great deal of money.
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