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Uses. Reusable writing surface on which text or drawings are made. 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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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. Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its ...
Some other photographs show chalk drawings that were deliberately created to be photographed for this book. The mathematicians themselves are not depicted. [1] Many of their comments relate to their tactile pleasure in using chalk, to the semi-permanence of partially-legible erasures from chalkboards, and to the pacing the use of chalk imparts ...
Calcite ( calcium carbonate) 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. Chalk is common throughout Western Europe, where deposits underlie parts of ...
Calabash chalk is a type of clay. Some people, especially pregnant women, eat calabash chalk as medicine. But calabash chalk contains heavy metals like arsenic and lead, which can be dangerous ...
Chalkboard art. Children's drawing on a chalkboard. Chalkboard art or chalk art is the use of chalk on a blackboard as a visual art. [1] 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. [2]
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