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A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
Chalkboard scraping, or noises that elicit an emotional response have been known to trigger tendencies from the fight or flight response which acts as the body's primary self-defense mechanism. Emotional response Distinct emotion
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Chalkboard art or chalk art is the use of chalk on a blackboard as a visual art. It is similar to art using pastels and related to sidewalk art that often uses chalk. Chalkboard art is often used in restaurants, shops or walls.
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Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor.
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Sidewalk chalk is typically large and thick sticks of chalk (calcium sulfate, gypsum, rather than calcium carbonate, rock chalk) that come in multiple colors and are mostly used for drawing on pavement or concrete sidewalks, frequently four square courts or a hopscotch boards.