(uncountable) A soft, white, powdery limestone (calcium carbonate, CaCO3).
chalk cliffs are not recommended for climbing
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(countable) A piece of chalk, or nowadays processed compressed gypsum (calcium sulfate, CaSO), that is used for drawing and for writing on a blackboard (chalkboard).
when working out your next move, it's a good idea to get some more chalk from the bag
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(countable) Tailor's chalk.
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