2007-01-23 13:56:46 · 6 answers · asked by Anonymous in Entertainment & Music ➔ Polls & Surveys
(as in the boards used in classrooms)
2007-01-23 13:57:10 · update #1
They were originally slate, on which the white chalk showed up well. As schooling spread, the use of blackboards developed, where black paint substituted the slate, which was not always available.
2007-01-23 14:08:43 · answer #1 · answered by Anonymous · 2⤊ 0⤋
Blackboards come from furniture factories.
2007-01-23 14:01:34 · answer #2 · answered by Anonymous · 1⤊ 0⤋
They grow in the blackboard jungle.
2007-01-23 14:03:40 · answer #3 · answered by Anonymous · 1⤊ 0⤋
they take boards and crush blackberrie and you get blackboard
2007-01-23 13:59:54 · answer #4 · answered by Wicked 7 · 1⤊ 1⤋
slate, which is a metamorpic rock changed from shale.
2007-01-23 14:00:37 · answer #5 · answered by word_life_4_ever_u 2 · 4⤊ 0⤋
I think they are made of slate.
2007-01-23 14:04:34 · answer #6 · answered by ? 6 · 1⤊ 0⤋