A) Precious metals 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 granite.
D) Shale is used to make tiles and bricks.
Correct Answer: C
Solution :
Black gold is another name of oil or petroleum. It is black when it comes out of ground and is worth a great deal of money.
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