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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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 ...
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 ...
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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 paint is a specialized paint that creates a chalkboard-like coating that can be utilized as a writing surface in the same manner as a traditional chalkboard. Chalkboard paint is commonly made out of a mixture of talc , [1] [2] acrylic , [1] water , glycol , titanium dioxide , [3] carbon black , [4] opacifiers , silica , [2] and esters .
Foods to limit on a Mediterranean diet include: Added sugar: added sugar is found in many foods but especially high in soda, candies, ice cream, table sugar, syrup, and baked goods. Refined grains ...
Get the nutrition lowdown on all your meals and everything in between. Find out the calories, carbs, fat, fiber, and more in over 37,000 foods and drinks. Whether you're eating out or dining in ...
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