Chalk is a delicate, white sedimentary rock composed of calcium carbonate. It’s fashioned from the buildup of the skeletal stays of tiny marine organisms, similar to coccoliths and foraminifera, which have settled to the underside of the ocean over hundreds of thousands of years. Chalk is a standard 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 recognized use of chalk for this function dates again to the thirteenth century, when it was used to put in writing on slate tablets. Within the nineteenth century, chalkboards turned a standard fixture in colleges and places of work, and chalk stays a preferred alternative for writing and drawing on these surfaces at this time.
