because they are black and they are a board.
I am pretty sure it's a teacher.
YEP!
black hole theory is called a statement
Because it's white and easily adheres to the blackboard. (this is physical)
educational software
The guys name is James Pillans. He invented this piece in 1801 and called it the blackboard. In the 1930s the name "chalkboard" was introduced. The blackboard is mostly for teaching. It has different variaties of colers,such as black,green,and brown.
Blackboard
a black board
A blackboard
Blackboard
Blackboard
blacksmith
A blackboard seems to fit.
i wrote on a black bored
A blackboard.
unsil
Chalk is used on the black board because chalk is easy to write with on a black board.