File:Multicoloured chalk.jpg

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English: Calcium carbonate is the usual name for chalk. Chalk, however, consists of calcium sulfate.
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Author Pixelmaniac pictures (Leave a reply)

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I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

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current06:53, 5 January 2014Thumbnail for version as of 06:53, 5 January 20144,912 × 3,264 (2.19 MB)Pixelmaniac pictures (talk | contribs)User created page with UploadWizard

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