few lines on black board
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black board is a board on which we can write using chalks. it is very helpful for learning and is usually used in schools and colleges
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1. A blackboard also known as a chalkboard.
2. It is a reusable writing surface on which text or drawings are made with sticks of calcium sulfate or calcium carbonate
3. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone
4. Modern versions are often green because the colour is considered easier on the eyes.
2. It is a reusable writing surface on which text or drawings are made with sticks of calcium sulfate or calcium carbonate
3. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone
4. Modern versions are often green because the colour is considered easier on the eyes.
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