'The "lead" used in pencils is actually this form of carbon once thought to be a type of lead'
graphite
LEAD: The lead used in pencils is actually this form of carbon once thought to be a type of lead
The "lead" used in pencils is actually this form of carbon once thought to be a type of lead
The "lead" used in pencils is actually this form of carbon once thought to be a type of lead
LEAD
graphite
LEAD