alleryEarly classroom blackboards were made from which natural material?
APolished marble
BBaked clay tiles
CSeasoned teak wood
DThin slate stone
Answer & Solution
Correct answer: D. Thin slate stone
1. Early blackboards needed a smooth, hard, dark surface for chalk.
2. Thin sheets of black or dark grey slate stone were used.
3. Marble, wood and clay tiles were not the original material.
_Source: Wikipedia, Blackboard, lead section_
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