Govt school kids create organic substitute for gypsum chalks
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City of Physics on X: "Blackboard chalk is made of gypsum, not chalk. Chalk is a type of limestone composed of the mineral calcite. http://t.co/tgS4tMMz63" / X
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These Hyderabad School Students Have Made An Organic Alternative For Regular Blackboard Chalks
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Chalk Hills Gypsum Mine gets approval for a 150-acre expansion
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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