Some Multicolored Abstract Chalks

black board and chalk like in school class.

multicolored abstract chalk randomly set.

multicolored chalks in bowl and cat is selecting from them.

pieces of chalk lied down in a line.

small cute black board for children with a colored chalk.

Some Chalk Magic

Chalk is a supple, white, porous sedimentary rock, a form of limestone created of the inorganic calcite. It forms under somewhat deep marine situation from the stepwise  accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores.
Chalk is resistant to withstanding and slumping contrasted to the clays with which it is generally associated.