Which
of the following is the not a natural abrasive?
Garnet
Emery
Boron-carbide
Corundum
Boron-carbide
Natural
abrasives are found in mines deposits which are diamond, garnet, corondum and
emery whereas, synthetic abrasives such as boron-carbide, silicon-carbide are
man-made.
Hence,
the correct option is (C).
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