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Chalk: A biological limestone formed from shell debris
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Chalk To Write On The School Blackboard It Is Also Known As Gypsum And Chalk Or Pastel It Is A White Clay That Prepared In Bars Is Used To Write On The
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Gypsum Powder School Chalk, Length : 10cm, 5cm, 6cm, 7cm, 8cm, 9cm, Feature : Disposable, Dustfree at Rs 5 / Box in Navi Mumbai
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Blackboard Chalk Isn't Chalk
These Hyderabad School Students Have Made An Organic Alternative For Regular Blackboard Chalks
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