Give reason:
Graphite is used to make lead of the pencils.
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Graphite can mark the paper black. So, it is used to make the lead of pencils.
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Give one use of each of the following substances:
(a) Iron
(b) Brass
(c) Coal
A frying pan is made up of steel but its handle is made up of wood.
Argon is filled in electric bulbs.
Copper and aluminium are used to make electric wires.