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Blackboard
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...
15 KB (1,649 words) - 12:10, 15 July 2024
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...15 KB (1,649 words) - 12:10, 15 July 2024
