Explanation: Graphite.Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light colour of the paper. Graphite pencils are used for both writing & drawing, & the result is durable: although writing can usually be removed with an eraser, it is resistant to moisture, most chemicals, ultraviolet radiation & natural aging. Other types and categories of pencil core are less widely used. Charcoal pencils are mainly used by