Chalk: Revision history

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14 July 2021

1 December 2020

17 July 2020

  • curprev 23:1023:10, 17 July 2020‎ Robinr78 talk contribs‎ 1,002 bytes +1,002‎ Created page with "{{Page-ok|07/20}}{{Header|Chalk 07/20}} '''Chalk''' is a soft, white, porous type of limestone mainly composed of '''calcium carbonate'''. Natural chalk consists of the amorp..."
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