Blackboard
From Wikipedia, a free encyclopedia written in simple English for easy reading.
A blackboard, also called a chalkboard, is a surface on which markings made with chalk are visible. It is used as a surface to write on.
Blackboards are often used to help teach in school. Blackboards are not used as much now. People use whiteboards instead. Whiteboards are used because some people are allergic to the dust the chalk used to write on chalkboards generate, and because the dust is hard to clean up when spilled.
Chalkboards are written on with chalk, which is actually not the stone chalk at all but a type factories make. Schoolteachers often use the chalkboard to display things at large. Chalkboards can be black or dark green, also called blackboards and greenboards. These chalkboards used to be great inventions, however now overhead projectors and whiteboards are more popular.
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