15 small lines on blackboard
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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. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
babli869:
it is the definition of blackboard
but you read the question first
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Hey mate here is your answer
a blackboard is a board that have a black and greenish colour. it was invented by James Pillians. we use it to write from Chalk. It is also known as chalkboard. Nowadays, There are many bright colour chalks. it is used in almost all schools. is it good way to write and teach children.it is operated by teachers. a blackboard are cheaper than any other boards. it does not run on electricity. it makes learning co-operative between teacher and student
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a blackboard is a board that have a black and greenish colour. it was invented by James Pillians. we use it to write from Chalk. It is also known as chalkboard. Nowadays, There are many bright colour chalks. it is used in almost all schools. is it good way to write and teach children.it is operated by teachers. a blackboard are cheaper than any other boards. it does not run on electricity. it makes learning co-operative between teacher and student
____________________________________
✔ please mark me brainliest✔
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