Chalk is a smooth, white sedimentary rock composed of calcium carbonate. It’s fashioned from the buildup of the skeletal stays of tiny marine organisms, reminiscent of coccoliths and foraminifera, which have settled to the underside of the ocean over hundreds of thousands of years. Chalk is a typical materials used for writing and drawing on chalkboards, and additionally it is used within the manufacturing of cement, plaster, and different constructing supplies.
Chalk has been used for hundreds of years for writing and drawing. The earliest identified use of chalk for this objective dates again to the thirteenth century, when it was used to write down on slate tablets. Within the nineteenth century, chalkboards turned a typical fixture in faculties and workplaces, and chalk stays a preferred alternative for writing and drawing on these surfaces right this moment.
