6. The 'lead' in a pencil is made of a mixture of graphite and clay.
'lead'
When the percentage of graphite is increased, the pencil slides across the paper more easily
Which statement explains this observation?
A Graphite has a high melting point.
B Graphite is a form of carbon.
C Graphite is a lubricant
D Graphite is a non-metal
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C. Graphite is a lubricant
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