Geography, asked by suthagareswaran, 1 year ago

Board is made up of rock or mineral

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Answered by DonOfRajasthan

Answer:

Unsourced material may be challenged and removed. A blackboard (also known as a chalkboard) is a reusable writing surface on which text or drawings are made with sticks of calcium sulfate or calcium carbonate, known, when used for this purpose, as chalk.

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