Description : Lead pencil contains – (1) lead (2) ferrous sulphide (3) lead sulphide (4) graphite
Last Answer : (4) graphite Explanation: Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased. Graphite pencils are used for both writing ... with an eraser, it is resistant to moisture, most chemicals, ultraviolet radiation and natural aging.