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  2. Occupational dust exposure - Wikipedia

    en.wikipedia.org/wiki/Occupational_dust_exposure

    A video on cleaning dust from workers' clothing. Occupational dust exposure occurs when small particles are generated at the workplace through the disturbance/agitation of rock/mineral, dry grain, timber, fiber, or other material. When these small particles become suspended in the air, they can pose a risk to the health of those who breath in ...

  3. Geophagia - Wikipedia

    en.wikipedia.org/wiki/Geophagia

    Geophagia (/ ˌ dʒ iː ə ˈ f eɪ dʒ (i) ə /), also known as geophagy (/ dʒ i ˈ ɒ f ə dʒ i /), [1] is the intentional [2] practice of consuming earth or soil-like substances such as clay, chalk, or termite mounds.

  4. Chalk - Wikipedia

    en.wikipedia.org/wiki/Chalk

    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.

  5. Agricultural lime - Wikipedia

    en.wikipedia.org/wiki/Agricultural_lime

    Agricultural lime, also called aglime, agricultural limestone, garden lime or liming, is a soil additive made from pulverized limestone or chalk. The primary active component is calcium carbonate. Additional chemicals vary depending on the mineral source and may include calcium oxide.

  6. Whitewash - Wikipedia

    en.wikipedia.org/wiki/Whitewash

    Whitewash, calcimine, kalsomine, calsomine, asbestis or lime paint is a type of paint made from slaked lime (calcium hydroxide, Ca(OH) 2) or chalk (calcium carbonate, CaCO 3), sometimes known as "whiting". Various other additives are sometimes used.

  7. Lime (material) - Wikipedia

    en.wikipedia.org/wiki/Lime_(material)

    In the lime industry, limestone is a general term for rocks that contain 80% or more of calcium or magnesium carbonate, including marble, chalk, oolite, and marl.Further classification is done by composition as high calcium, argillaceous (clayey), silicious, conglomerate, magnesian, dolomite, and other limestones. [5]

  8. Blackboard - Wikipedia

    en.wikipedia.org/wiki/Blackboard

    The dust also precludes the use of chalk in areas shared with dust-sensitive equipment such as computers. The writing on blackboards is difficult to read in the dark. Chalk sticks shrink through use, and are notorious for breaking in half unless inserted in a writing utensil designed for chalk. Blackboards can suffer from ghosting.

  9. Calabash chalk - Wikipedia

    en.wikipedia.org/wiki/Calabash_Chalk

    The practice of eating calabash chalk is observed by both sexes and different age groups of people of African descent, for the purpose of pleasure. However, it is prevalent among women, predominantly during pregnancy, who claim it prevents vomiting, over-salivation and nausea. [1] Calabash chalk is also used to make facial masks and soaps. [6]