When I was a student, it was slate. Then "greenboards" came, made of composite material, lighter and more easily maintained.
Not much longer until "whiteboarding" economics of scale click in.
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In many of the schools in the early history of the U.S. and its western territories, the students used a slate as a writing tablet. There was a large slate blackboard in the front of the classroom for the teacher's use, as there was until a few years ago when greenboards were introduced for that purpose. The student's slate was about 10"x12". Slates and blackboards were marked by using chalk, rather than a pencil.
the wall are made of clay.the top was made out of grases
yes there were coins made in the past there are some that were made in 1910
logs were made into lumber and iron was made into horsesshoes and thread was made into cloth and grain was made into flour
Yes, Lincoln cents were made in 1966 2,188,174,783 were made.
you dont
Blackboard Inc. was created in 1997.
The population of Blackboard Inc. is 1,780.
Beyond the Blackboard was created on 2011-04-24.
advantages and disadvantages of blackboard
The duration of Murder on the Blackboard is 1.18 hours.
The Sanskrit term for blackboard is "कृष्णपट्टिका" (pronounced as krishnapattika). In this compound word, "कृष्ण" (krishna) means black, and "पट्टिका" (pattika) refers to a board or slate. So, when translated literally, "कृष्णपट्टिका" means a black board or slate used for writing or drawing.
The duration of Beyond the Blackboard is 1.67 hours.
A blackboard is a smooth, dark surface typically made of slate or a similar material, used for writing or drawing with chalk. It is commonly found in classrooms and other educational settings.
Go to google and type in your state and blackboard and it should come up.
"Blackboard" in Chinese is 黑板 (Hēi băn)
The surface area depends on the height and width of the blackboard.